Perrin 3" Catback Exhaust
 

Hey everyone! So I've been debating on if the Perrin 3" Catback Exhaust is the right one for my car. My car is completely stock and I really have no plans to go full exhaust for a while. At first I was going to go with the 2.5" unresonated exhaust but some people have been saying the 3" resonated or unresonated exhaust gives the car a better tone. Which should I go for? Unresonated or resonated on 3" or just stick with a 2.5"? All I want in my exhaust is no drone, nice rumble/growl at the low rpms (casual driving), and nice sound on WOT. I just want an exhaust that gives a noticeable sound difference from stock (can actually hear the exhaust was changed out basically). Thanks!

Second this, I would like to know the same thing. Also what's the difference between the 2.5" and 3"? Besides the obvious half inch, why the half inch more?

@uEih the .5" extra allows for more flow... it also is a bit louder.
@JohnAyySays I have the 3" perrin resonated on my car. It is dreamy. No drone, just great sounding. Also, not too loud, driving with windows up is completely reasonable. It is hard not to rev when sitting at a light!

[ame="http://www.youtube.com/watch?v=X-F0TECUuYM"]Drift-Office : Vortech Supercharger BRZ / FRS / GT86 with Full Perrin Exhaust (Catted) - YouTube[/ame]

Perrin 3 Inch RES exhaust. Sounds awesome! :)


Bob @ Drift-Office, LLC

Nice! Do you think the 3" has to be solely used on turbo/supercharged cars? Is yours NA? Any mods other than exhaust?

THere's no reason to run a 3 inch exhaust on a NA car - generally, you'll loose torque and it's a louder exhaust note. I prefer to see at least a 3 inch in FI environments since most of the FP / OP offerings are still 2.5 inch to ensure crossmember clearance, etc etc...


Bob @ Drift-Office, LLC

My innovate kit gets installed next week. I have a Perrin 3" front pipe as well. Innovate IC kit + flex fuel on their way.

The Perrin 3" provides just the right exhaust note and volume I was looking for (currently still NA). There was no noticeable loss in torque down low although as many have said you probably will have some.

Where I did notice a differene in torque was after installing the 3" front pipe. Still doesn't bother me as I am setting up for FI.

I've heard both in person. Here are my thoughts:

1) The 2.5" versus 3" on a non-FI car will not yield any significant gains, if any at all
2) The 3" is the best choice if your plans are FI down the road with a proper intake, headers, over pipe & front pipe
3) ultimately, your catback (I mentioned this in another thread somewhere) is only as efficient as what's coming out of the engine. If the rest of your system is stock, you could have a 5" catback (lol) and it wouldn't change anything
4) The sound...the 3" somehow seems more refined. While it's slightly bass-ier, under WOT and spirited acceleration, it's not as harsh nor is it as harsh for daily IMO. The slight less resistance from the larger diameter piping seems to smooth things out.

Personally, I'd go 3". Sets you up for down the road, it's a bit smoother tone-wise and the cost difference is minimal.

John,
The best way for me to answer your question, is to have you look at Jeff's new blog post that also has a dyno graph as well!

http://blog.perrinperformance.com/3-...ults-and-tune/

Let me know if you have any further questions :happyanim:

As I mentioned, there is virtually no difference. 5whp is not noticeable in any way, I understand you have to advertise this as they are gains, but you can't advertise this (not saying that you are/you did) as any significant gains (on an un-tuned car).

However, as I've mentioned all along, the standard trio of intake, exhaust and tune proves to be the winner here (like always). The 3" exhaust components with a 3" intake and tune are the only way you'll see a difference. 30whp is a nice increase, there's no doubt.

A few other thoughts:
-I find the 3" is a smoother sounding exhaust (despite having slightly louder overall volume). This would be my choice just for that aspect.
-3" is a great option to leave you open for further mods down the road (FI)

Ultimately, trying to squeeze out 2-3whp here and there on a budget is completely useless. You gotta pay to play. $3100 for 30whp on these cars in N/A format, ouch. But, I think this 3" option is the way to go because FI will be the only way to make any noticeable power, and FI will require a 3" setup (especially turbo).

Using a 2.5" versus 3" on a turbo system, big difference (especially with a test pipe). I gained 38whp/28wtq on my car going from the OEM 2.25" to 3" exhaust (not an FA20).

Overall, very nice results on the stage 3. :thumbsup:

3" ftw. I love mine.

Been waiting to see that post for a long time now. Thanks.

Isn't it a common practice to use 2.5" pipes for up to 300hp, then go larger to 3" if you have more? I remember seeing a clip about this on Horsepower TV once. Anyone?

.ck