Reduce the BOV (blow off valve) sound on aftermarket intakes?

[Eric Arroyo]

I'm looking to add intakes in the near future, but I've noticed that all of the aftermarket intakes make the stock blow off valve much louder.

I'd love the performance improvement of new intakes, but this is my daily driver and hearing PSHHHH every time I accelerate remotely quickly would be cool for about a week, then get annoying (maybe I'm just a boring old man).

Anyway, does anyone know if it's possible to have aftermarket intakes without an excessively loud BOV sound?

I don't mind a little PSHHH sound. I just don't want it to sound like I'm in a scene from a Fast and Furious movie when I'm just driving through a grocery store parking lot

 

[DaJackson]

Add a plastic box that surrounds the filter to reduce the noice. Aka keep a stock intake.

Get K&N panel filters instead of a full replacement.

As an FYI, the sounds from new intakes in not the same as from an aftermarket HKS SSQ.

 

[MrSmoofy]

I'm looking to add intakes in the near future, but I've noticed that all of the aftermarket intakes make the stock blow off valve much louder.

I'd love the performance improvement of new intakes, but this is my daily driver and hearing PSHHHH every time I accelerate remotely quickly would be cool for about a week, then get annoying (maybe I'm just a boring old man).

Anyway, does anyone know if it's possible to have aftermarket intakes without an excessively loud BOV sound?

I don't mind a little PSHHH sound. I just don't want it to sound like I'm in a scene from a Fast and Furious movie when I'm just driving through a grocery store parking lot

Don't take this the wrong way but you are asking for performance without sound. Maybe get a Tesla?

A couple of things, find someone near you that has it so you can hear it. The air sucking is mild under normal acceleration and you only hear the blowback if you abort the acceleration so the air you just spooled up has the go somewhere to me it's like asking your engine to take a deep breath and then ok never mind but don't exhale either.

You can control how loud it is based on your acceleration so the loudest is you jump on the throttle at full and jump back off seconds later. I should have video's of mine on my Injen Review post hopefully by tomorrow I'll try to include some normal driving so people can hear how you can control it but not sure how well my phone will pick it up.

 

[SKStinger]

Don't take this the wrong way but you are asking for performance without sound. Maybe get a Tesla?

A couple of things, find someone near you that has it so you can hear it. The air sucking is mild under normal acceleration and you only hear the blowback if you abort the acceleration so the air you just spooled up has the go somewhere to me it's like asking your engine to take a deep breath and then ok never mind but don't exhale either.

You can control how loud it is based on your acceleration so the loudest is you jump on the throttle at full and jump back off seconds later. I should have video's of mine on my Injen Review post hopefully by tomorrow I'll try to include some normal driving so people can hear how you can control it but not sure how well my phone will pick it up.

Agreed. I don’t notice my intake unless I want to. Only then do you hear the suction. Try out a DIY intake. It’s a small investment so if you don’t like it, remove it and stick to the stock air box.

 

[Eric Arroyo]

to me it's like asking your engine to take a deep breath and then ok never mind but don't exhale either.

Lol, awesome analogy . But I feel like, what I'm really asking, is for the car to just not exhale through a whistle haha.

I'm also not sure why you only hear the BOV sound with aftermarket intakes, but not the stock intakes. I took a look at my BOVs and it looks like the outlet routes back into the intake. So is it just because of the more open intakes that I can hear the sound? I'm wondering if just putting a custom box around the filters, like @DaJackson suggested, would do the trick.

And I'd definitely like to hear what yours sounds like under normal driving. All of the videos I've seen are of what it sounds like with intentional high revving. I'll keep an eye out for the video

 

[robz32]

The BOV sounds only when you get your foot on it and then let off, in normal city driving you will not hear any of that. Not even while cruising on the highway.

 

[nhcowboy28]

Lol, awesome analogy . But I feel like, what I'm really asking, is for the car to just not exhale through a whistle haha.

I'm also not sure why you only hear the BOV sound with aftermarket intakes, but not the stock intakes. I took a look at my BOVs and it looks like the outlet routes back into the intake. So is it just because of the more open intakes that I can hear the sound? I'm wondering if just putting a custom box around the filters, like @DaJackson suggested, would do the trick.

And I'd definitely like to hear what yours sounds like under normal driving. All of the videos I've seen are of what it sounds like with intentional high revving. I'll keep an eye out for the video

Technically the stock setup is a diverter that recirculates the air into the intake. This is why you don’t hear it on the stock air box as it is sealed very well.

The aftermarket air intakes provide a path for that sound to escape the intake tubing via the open or filter (or if you recirc to air the stock diverter ).

 

[MrSmoofy]

Lol, awesome analogy . But I feel like, what I'm really asking, is for the car to just not exhale through a whistle haha.

I'm also not sure why you only hear the BOV sound with aftermarket intakes, but not the stock intakes. I took a look at my BOVs and it looks like the outlet routes back into the intake. So is it just because of the more open intakes that I can hear the sound? I'm wondering if just putting a custom box around the filters, like @DaJackson suggested, would do the trick.

And I'd definitely like to hear what yours sounds like under normal driving. All of the videos I've seen are of what it sounds like with intentional high revving. I'll keep an eye out for the video

The OEM is all sealed up and has less air mostly why you dont hear it. Also there is no whistle just air rushing In and out

 

[Doel]

I would imagine the cold air intakes are a bit quieter than the ram airs, any with an actual CAI care to chime in?

 

[Shrikecorp]

The BOV sounds only when you get your foot on it and then let off, in normal city driving you will not hear any of that. Not even while cruising on the highway.

Hrm. I'm afraid I have been called out as not normal. Again.

 

[MrSmoofy]

I'm looking to add intakes in the near future, but I've noticed that all of the aftermarket intakes make the stock blow off valve much louder.

I'd love the performance improvement of new intakes, but this is my daily driver and hearing PSHHHH every time I accelerate remotely quickly would be cool for about a week, then get annoying (maybe I'm just a boring old man).

Anyway, does anyone know if it's possible to have aftermarket intakes without an excessively loud BOV sound?

I don't mind a little PSHHH sound. I just don't want it to sound like I'm in a scene from a Fast and Furious movie when I'm just driving through a grocery store parking lot

Here is a video it's a little long but should let you hear as much as my phone would pick up. You can hear it better with headphones.

 

[Chucky]

Agree with everyone's comments; not noticeable unless you want to hear it, you control the volume with your right foot. Also, you would not be able to apply enough throttle in a parking lot to make a blow-off whistle with any degree of safety.

Are you planning on installing an exhaust? Not sure you'll get much out just an intake. Engine = Suck, Squish, Bang, Blow You'd be improving the suck but not the blow limiting the effect of more air volume to the engine. Also some intakes are louder than others, I have Injen and it's one of if not the loudest

 

[bluegrass_gt2]

You want loud?? Try this hood with HKS dual BV's... BV's are right at that opening.. I only hear the pop sound after we punch it and then let off the gas. Normal driving i don't hear it.

Also CAI's are noisier than stock. We have used both K&N and Agency Power and the later is louder IMHO. I personally prefer the K&N they seem a bit quieter, but my son prefers the Agency power. guess a generational thing

Jeff

 

[Eric Arroyo]

Here is a video it's a little long but should let you hear as much as my phone would pick up.

Excellent video! This is exactly what I was looking to see/hear. It's good to see that, under normal acceleration you won't hear either the sucking or blow off. This seems way more "tolerable" for daily driving. And it makes a great sound when you want it to. Huge thanks for the video! I feel much better about picking up an intake now

Do you notice any difference in performance/throttle response? I'm wondering if the benefits will only be seen with a tune to go along with the intakes.

 

[Eric Arroyo]

.. I only hear the pop sound after we punch it and then let off the gas. Normal driving i don't hear it.
Jeff

First off, that Stinger looks incredible! Second, it's good to know that, even with the cutout and aftermarket BOVs, you still don't hear it under normal driving conditions. It's also good to know about the difference between the K&N and the Agency Power intakes. Did you notice any performance difference between the two?

 

[bluegrass_gt2]

First off, that Stinger looks incredible! Second, it's good to know that, even with the cutout and aftermarket BOVs, you still don't hear it under normal driving conditions. It's also good to know about the difference between the K&N and the Agency Power intakes. Did you notice any performance difference between the two?

I can not tell the difference, however my son claims the Agency power feels more responsive. Also consider we have VelossaTech BigMouths which increases airflow to the CAI's. I believe I am personally biased regarding CAI's . I have been using k&N products for over 40 years in every car or truck i have ever owned and I like to stick to what works.

 

[Manaz]

Many CAIs will use K&N filters (on other cars if not yet Stingers).

 

[Eric Arroyo]

you would not be able to apply enough throttle in a parking lot to make a blow-off whistle with any degree of safety.

Haha, good to know

Are you planning on installing an exhaust? Not sure you'll get much out just an intake. Engine = Suck, Squish, Bang, Blow You'd be improving the suck but not the blow limiting the effect of more air volume to the engine. Also some intakes are louder than others, I have Injen and it's one of if not the loudest

Maybe downpipes, but I saw some testing, I think from Tonkabob, where the Cat delete's didn't make a difference. He did a few runs with the deletes on, then put the stock exhaust back on and got similar or better results on 1/4 mile times. Granted, many different factors could have affected the results. Same day and track, but different ambient temps, etc.

I think Terry@BMS also posted something about how the exhaust wasn't a very limiting factor, but the intakes and intercooler were big limiters. I'll have to take a look back through the forum to see if I can find those posts.

If I did go full exhaust, I'd be looking at a EVC exhaust so I could "turn down the volume" when I pulled into my neighborhood. However, I'm not a huge fan of the Jun BL EVC sound. Just a personal preference. Some of the audio clips I heard sound decent at idle and low RPM, but there's an awful rattle at high RPM in every video I've seen.

I suppose I could just go with these dump valves haha

 

[bluegrass_gt2]

Haha, good to know



Maybe downpipes, but I saw some testing, I think from Tonkabob, where the Cat delete's didn't make a difference. He did a few runs with the deletes on, then put the stock exhaust back on and got similar or better results on 1/4 mile times. Granted, many different factors could have affected the results. Same day and track, but different ambient temps, etc.

I think Terry@BMS also posted something about how the exhaust wasn't a very limiting factor, but the intakes and intercooler were big limiters. I'll have to take a look back through the forum to see if I can find those posts.

If I did go full exhaust, I'd be looking at a EVC exhaust so I could "turn down the volume" when I pulled into my neighborhood. However, I'm not a huge fan of the Jun BL EVC sound. Just a personal preference. Some of the audio clips I heard sound decent at idle and low RPM, but there's an awful rattle at high RPM in every video I've seen.

I suppose I could just go with these dump valves haha

We have installed ARK Performance catless secondary down pipes, ARK Performance GRIP Catback exhaust and there was noticeable difference in acceleration, but with performance, in this case, means louder. Outside it was a slight tone difference, beefier, but inside we do have a bit of drone. Now i love the slight drone due to my love of muscle cars and hearing the exhaust, but to some it may be a bit much cruising down the highway. As for neighborhoods still very quit and will not disturb anyone..

 

[MrSmoofy]

Haha, good to know



Maybe downpipes, but I saw some testing, I think from Tonkabob, where the Cat delete's didn't make a difference. He did a few runs with the deletes on, then put the stock exhaust back on and got similar or better results on 1/4 mile times. Granted, many different factors could have affected the results. Same day and track, but different ambient temps, etc.

I think Terry@BMS also posted something about how the exhaust wasn't a very limiting factor, but the intakes and intercooler were big limiters. I'll have to take a look back through the forum to see if I can find those posts.

If I did go full exhaust, I'd be looking at a EVC exhaust so I could "turn down the volume" when I pulled into my neighborhood. However, I'm not a huge fan of the Jun BL EVC sound. Just a personal preference. Some of the audio clips I heard sound decent at idle and low RPM, but there's an awful rattle at high RPM in every video I've seen.

I suppose I could just go with these dump valves haha

I have the ARK Perfomance Secondary Downpipes and did the Dyno on that. Yes very little HP gain some torq gains but mostly I was looking for additional exhaust sound which is what it gave me. I'm still trying to decide which cat back setup I want I just need to find people that have them to hear them.