Loudvalves Boost Activated Exhaust Cutouts

[FokalPoint]

Hey Everyone,

Planning on ordering a set of 2.5" Loudvalves Boost Activated Exhaust Cutouts this weekend and having them install next week. Many of you have probably heard about the electronic cutouts or the EVC exhaust systems that are out there, but haven't heard about these.


These cutouts essentially operate the same as the electric ones but instead of using servo motors to either be open or closed all the time, these use either boost or vacuum to open/close the butterfly valve. This means they are only open when you are hitting boost, and the amount of boost it takes to open the valves can be controlled by a simple manual boost controller. The loudvalve ones start to open at 3psi, and are fully open at 6-7psi, using the built in spring. Basically like an external wastegate, but these NO EFFECT on the boost pressure of the turbos. The advantage to this over the electric ones is that it opens almost instantly, and only when on WOT. These also have no motors that will eventually burn out.

I plan on installing mine somewhere on the midpipe right before the secondary cats using a y-pipe and dump tube to angle the exhaust flow down away from the car. Fumes shouldn't be an issue since these will only be opening under load at speed. I'll also be installing their electric solenoid kit that allows you to bypass the vacuum line going to each cutout. This gives even further control for those times you wanna get on the throttle hard, but keep things quiet.

Reason I chose to go this route was to save money and also maintain the quiet ride around town while commuting to and from work, but still have that amazing exhaust sound under spirited driving conditions.

 

[FokalPoint]

Saving this space for post installation photos and videos.

 

[Bonsai]

I am very interested in this, I really wanted a smart EVC like Xforce offers, but running JB4 I don’t know how that would work since I hear OBD splitters sometimes cause issues. But I definitely like more the idea of a vacuum controlled dump. I’m going to look at them right now, but definitely want to see the install and video if possible.

 

[FokalPoint]

Here's a great video that explains things nicely and has some quality footage.

This guy has some footage as well with his WRX using the Loudvalves mounted on his downpipe and it sounds awesome haha. Skim through to see him mounting them and installing a homemade boost controller to control when they are activated, the driving portion starts at like 14:45.

 

[FokalPoint]

I am very interested in this, I really wanted a smart EVC like Xforce offers, but running JB4 I don’t know how that would work since I hear OBD splitters sometimes cause issues. But I definitely like more the idea of a vacuum controlled dump. I’m going to look at them right now, but definitely want to see the install and video if possible.

Meant to tag you before. See above for videos on other vehicles.

 

[Bonsai]

Meant to tag you before. See above for videos on other vehicles.

Thanks just watched them. Looks like I will be doing this. I just have to figure out how I will route or position it. I may just use it as a "muffler delete" for now until I can build my own exhaust system to incorporate them a different way.

 

[Bonsai]

I wonder if you can run 2 in series... Or I may be over complicating it lol. Where are you going to be pulling the boost line from?

 

[FokalPoint]

Thanks just watched them. Looks like I will be doing this. I just have to figure out how I will route or position it. I may just use it as a "muffler delete" for now until I can build my own exhaust system to incorporate them a different way.

I am planning on mounting mine on the mid-pipe if there is room for one on each side, so parallel setup. I feel like that would give the most performance increase as well when open by removing the most restriction.

I wonder if you can run 2 in series... Or I may be over complicating it lol. Where are you going to be pulling the boost line from?

There would be no benefit from running in sequence because the exhaust flow will take the path of least resistance for the most part. That means little to no exhaust gas would be flowing to the next cutout/rest of the exhaust.

 

[stinker]

Hi FokalPoint,

Did you end up installing these? I'm very interested to hear the outcome.

Cheers

 

[FokalPoint]

Hi FokalPoint,

Did you end up installing these? I'm very interested to hear the outcome.

Cheers

Hey,

Sorry for abandoning the thread. I ended up doing a muffler and resonator delete instead. In the end I decided I wanted the sound all the time so I had the piping run to the back bumper to avoid some of the drone and then used sound deadening material in the trunk. It’s comfortable at all speeds and driving conditions in my opinion. Even my dad, who is really picky about exhaust and drone likes it.