New 3.3L Catback option(s)

[Manaz]

That's the first time I've seen a Stinger catback manufacturer claim an increase in HP. The skeptic in me thinks they're making stuff up.

If the catback exhaust removes or reduces flow restriction of the whole exhaust system, then it can help to provide power gains (as turbo engines need as free-flowing exhaust as they can get. If the aftermarket pipes are larger diameter or have better bends (mandrel formed rather than press-bent), then they should be able to achieve this.

I'm generally more sceptical of axle-back power gain claims, as by that stage exhaust gases have cooled, have less volume as a result and therefore are less likely flow-compromised by restrictions. Axle-back exhausts generally just make noise.

 

[Kazz]

If the catback exhaust removes or reduces flow restriction of the whole exhaust system, then it can help to provide power gains (as turbo engines need as free-flowing exhaust as they can get. If the aftermarket pipes are larger diameter or have better bends (mandrel formed rather than press-bent), then they should be able to achieve this.

I'm generally more sceptical of axle-back power gain claims, as by that stage exhaust gases have cooled, have less volume as a result and therefore are less likely flow-compromised by restrictions. Axle-back exhausts generally just make noise.

You're making assumptions about where the flow issues are in the entire engine exhaust system - downpipe, midpipe, axle-back, muffler, etc. Those need to be known before you can find real solutions.

 

[Manaz]

You're making assumptions about where the flow issues are in the entire engine exhaust system - downpipe, midpipe, axle-back, muffler, etc. Those need to be known before you can find real solutions.

Yes, I made an assumption - but I called that out quite clearly: "If the catback exhaust removes or reduces flow restriction of the whole exhaust system".

 

[YOWStinger]

I am interested in this exhaust option - it seems to work on the principal of a chamber to cancel harmonics (I've seen it before, I can't recall the name) to kill drone.

Magnaflow does it



Ark does it



Looks like Jun does it too, a little hard to tell here

 

[Manaz]

The Jun option seems to have an exhaust tip coming out of each chamber. I believe they use the larger chamber primarily, with the smaller chamber only opened up when required.

Edit: I think you have the wrong pic for Jun - I see on the K8 Stinger Store they have one with the Helmholtz chamber (I went and looked it up).

The Magnaflow option looks interesting...

 

[nhcowboy28]

Magnaflow does it

View attachment 25277

Ark does it

View attachment 25278

Looks like Jun does it too, a little hard to tell here

View attachment 25280

Helmholtz Resonators

 

[NYdito]

Hey guys I’m planing on getting this exhaust and I currently have the SSR down pipe so I could give you guys my feed back when I get them. Also I’m going to do some video so you guys could hear it and see if it does not have drone.

 

[Manaz]

Drone is really hard to capture/play back in videos - it is generally a specific frequency in a given car, and there are a number of reasons why playback may not show it well.

 

[YOWStinger]

The Jun option seems to have an exhaust tip coming out of each chamber. I believe they use the larger chamber primarily, with the smaller chamber only opened up when required.

Edit: I think you have the wrong pic for Jun - I see on the K8 Stinger Store they have one with the Helmholtz chamber (I went and looked it up).

The Magnaflow option looks interesting...

Yeah, I have that attached too, they have a resonator on the 2.0 exhaust, but it's different on the 3.3

 

[YOWStinger]

Drone is really hard to capture/play back in videos - it is generally a specific frequency in a given car, and there are a number of reasons why playback may not show it well.

What I'm missing is the H pipe on my HKS exhaust on my Z made a hooting sound under part throttle around 3500rpm, I liked that exhaust a lot, too bad that's not available.

 

[NYdito]

Drone is really hard to capture/play back in videos - it is generally a specific frequency in a given car, and there are a number of reasons why playback may not show it well.

Agreed that’s why I could give my feed back since I drive it daily.

 

[DaJackson]

Getting this thread back on track. Discussion of rules as been taken off thread.

 

[nhcowboy28]

I'm gonna take one for the team and order this tonight.

Probably gonna take a few weeks to get.

 

[Manaz]

I like that they offer a non stainless version. Most of us will not have this car forever anyways!!

Good stainless is critical in some environments (particularly where roads are salted in winter).

If you live somewhere that doesn't happen, mild steel can actually be quote a good option - it can sound better too, as it tends to be thicker than SS, and thus gives a deeper exhaust note.

 

[StungBlueGT2]

Got this email today. They've released 2 "drone free" catback options for the Stinger 3.3. One is 304stainless and the other is aluminized.

View attachment 25125

Mod edit: removed some advertising language.

I have to say this is one of the best sounding catbacks I’ve heard for the Stinger. Sounds similar to a muffler delete but supposedly no drone. That would be the best of both worlds if it’s true. Curious why it’s half the price of other catbacks. Is MBRP reputable or just a get what you pay for type of situation?

 

[Hydrajin]

we need an early adopter ................Secondchance ????? what are the Pro vs Con of the 2 metals ??

SS all the way, non SS exhausts are not even an option when upgrading to aftermarket. SS is tougher and much more corrosion resistant so they technically could use a lighter gauge and it would still last much longer than steel, it should be a fair bit lighter. SS is a superior metal all around even if you live in a dry hot area, it would still benefit having stainless setup as it resists corrosion due to heat cycling; heat cycling accelerates reaction with moisture in the air and the exhaust gas itself.

 

[nhcowboy28]

I'm gonna take one for the team and order this tonight.

Probably gonna take a few weeks to get.

Baseline decibel readings using a really high end reader from amazon for $20 (sarcasm). I’m sure +/- 5 dB easily.

Max dB stock


4 hours sitting

Exterior Startup:78.9

Exterior Rev:91.5

Interior Startup:65.1

Interior rev:73.0

Interior idle:41.2


Overnight sitting

Exterior Startup:82.4

Exterior Rev:97.7

Interior Startup:65.3

Interior rev:72.1

Interior idle: 43.1

Outside idle:70.9


Normal sitting

Exterior Startup:78.7

Exterior Rev:90.3

Interior Startup:66.2

Interior rev:69.7

Interior idle: 41.9


Driving (in sport mode)

82.6 interior win up driving wot

86.3 interior win down driving wot

66.6 interior win up driving normal acceleration

70.3 interior win up driving cruising

73.6 interior win down driving normal acceleration

72.3 interior win down cruising

 

[DaJackson]

Baseline decibel readings using a really high end reader from amazon for $20 (sarcasm). I’m sure +/- 5 dB easily.

Max dB stock


4 hours sitting

Exterior Startup:78.9

Exterior Rev:91.5

Interior Startup:65.1

Interior rev:73.0

Interior idle:41.2


Overnight sitting

Exterior Startup:82.4

Exterior Rev:97.7

Interior Startup:65.3

Interior rev:72.1

Interior idle: 43.1

Outside idle:70.9


Normal sitting

Exterior Startup:78.7

Exterior Rev:90.3

Interior Startup:66.2

Interior rev:69.7

Interior idle: 41.9


Driving (in sport mode)

82.6 interior win up driving wot

86.3 interior win down driving wot

66.6 interior win up driving normal acceleration

70.3 interior win up driving cruising

73.6 interior win down driving normal acceleration

72.3 interior win down cruising

You’re going to need a lot more info to use these to compare to anything else.

Where was the microphone?
What RPM was a “rev” to?
How fast were you going for the driving tests?
What is “normal acceleration”?

 

[nhcowboy28]

You’re going to need a lot more info to use these to compare to anything else.

Where was the microphone?
What RPM was a “rev” to?
How fast were you going for the driving tests?
What is “normal acceleration”?

Well. Mic external was 1.5 feet from the right exhaust (dead even)

Internal was at ear level.

Revs were -5500

Normal is what most grown adults drive off as if they aren’t driving like lunatics.

This is more for MY reference as I’d repeat each test the same way with the new exhaust.

Meaning... the delta from the new exhaust versus old will be valid for my tests and a useful indicator on sound increase relative to my before and after. Not the exact decibel max for others.

 

[YOWStinger]

Great reference, thanks for putting in the effort for the rest of us