Perrin owners...

[Varelco]

Hi guys, I recently fitted a Perrin 2.5" resonated catback to my GT86 and I have to say I'm really pleased it, sounds great, no drone, just a nice deep rumble and I can barely hear it on the motorway, however I can't help but feel its incomplete and would benefit from the catted front pipe too. My question is will it be much louder? Is there anybody who went from just the catback to the full system (header or overpipe back)? I know the Perrin system in general is pretty quiet compared to others on the market but I'm concerned at how much louder it will be.

If it makes minimal difference (sound wise) then I plan to have a tune along with the cosworth panel filter thats fitted to get the most out of the setup.

Thanks in advance
Matt

[Jtbirchfield]

I just got a Invidia 2.5" catless front pipe and bolted it up to my 3 inch resonated Perrin cat back. It sounds amazing and isn't much louder. No drone when cruising on highway either. I recorded it on my iPhone so the quality isn't the best. MUCH deeper in person.

[ame="http://youtu.be/CZ19mEhGNLE"]http://youtu.be/CZ19mEhGNLE[/ame]

[Cop]

If you're going to get a header it's going to be loud with a catless front pipe.

[Freeman]

I went from the 3 inch cat back to the over pipe and 3 inch front pipe (which they don't make any more) and a UEL header. Fucking loud doesn't even begin to describe it. Now it has a dual resonated and catted 3inch front pipe. It's still damn loud but quieter than before. I'm toying around with having the Perrin resonator in the mid pipe replaced with a muffler to tone it down but keep the flow.

If I were to do everything over I'd go with a header, and 2.5inch header back. Preferably a large resonator and a cat in the front pipe.

[DarkSunrise]

My car got much louder going from Perrin CBE to a full headerback system (JDL catless UEL header, JDL OP, catted/NR front pipe, Perrin resonated CBE).

I'm currently running just a catted/NR front pipe and Perrin resonated CBE. I miss the UEL rumble and top-end pull, but my wife still thinks it's loud as is, so I'm stuck.

If I were you, I'd go with a catless header first if you want gains and more sound.

[Varelco]

Thanks for the input guys. I think I need to reiterate my first post, I dont want it to be any louder reallu, I had no intention on going catless or replacing the header. The stock header will stay, its just replacing the front pipe with Perrin's catted one. If its going to be dramatically louder then I will leave the stock one on, I didnt think it would make much of a difference, the resonator on the front pipe is tiny and the cat would be just a highly flowing one.

EDIT: Or am I misunderstanding that I'd benefit the most from changing the header rather than front pipe?

[EzyBrzy]

From what I understand, you get the most gains from a header. Well bolt-on wise. I've heard the FP is a little restrictive but you won't get much power from changing it out. If you're looking for more HP, then there is nothing else besides FI and flex fuel.

[steve99]

Originally Posted by Varelco

Thanks for the input guys. I think I need to reiterate my first post, I dont want it to be any louder reallu, I had no intention on going catless or replacing the header. The stock header will stay, its just replacing the front pipe with Perrin's catted one. If its going to be dramatically louder then I will leave the stock one on, I didnt think it would make much of a difference, the resonator on the front pipe is tiny and the cat would be just a highly flowing one.

EDIT: Or am I misunderstanding that I'd benefit the most from changing the header rather than front pipe?

have a read of the Basic bolt on Mods guide link below.

Perrin's are great catbacks by themselves, but combined with catless header and catless frontpipe its going to be loud.

If you want to add catless headers and frontpipe/overpipe for max power then put your stock catback back on. It will be quiet and you can sell perrin catback.

with the catless headers ect stock catback will be louder than stock (but likely as quiet as perrin is now) but not ear bleading loud like perrin will be with catless header and hi flow front pipe, their is virtually no power in catbacks its just sound

[ajc209]

cat back might add 5hp as does a manifold. Front pipe generally adds less.

People go on about 20WHP gained with a manifold and tune, but forget that just a tune would have added 15WHP in the first place.

Cat back also adds about 20WHP with a tune over stock.

JDL do an ultra quiet front pipe with a big resonator which shouldnt add much noise.

https://jdlautodesign.net/shop/ft86-...et-front-pipe/

[FirestormFRS]

A header without cats+op+catted fp+perrin cbe= Super duper loud and a tad raspy/droney. Same setup with the HKS dual resonated FP=Still loud but not obnoxious. Sounds amazing outside of the car, a bit tedious at constant RPM such as interstate driving.

[DarkSunrise]

Originally Posted by Varelco

Thanks for the input guys. I think I need to reiterate my first post, I dont want it to be any louder reallu, I had no intention on going catless or replacing the header. The stock header will stay, its just replacing the front pipe with Perrin's catted one. If its going to be dramatically louder then I will leave the stock one on, I didnt think it would make much of a difference, the resonator on the front pipe is tiny and the cat would be just a highly flowing one.

EDIT: Or am I misunderstanding that I'd benefit the most from changing the header rather than front pipe?

Yeah most of the gains are going to come from deleting the primary cat and going with a header. The problem is how much sound it adds. Probably best to start there and pair it with the stock exhaust for the most gains with the least sound.

That said, catted/NR FP + Perrin resonated CBE isn't too loud. Still very smooth, but moderately loud when you get on the throttle. Go for it.

[Varelco]

Ok I understand, interesting to find out that the catback doesn't really do much for power in general. It looks like I should of started with the front first. So if I went with a catless header and front pipe but kept the catback stock I could achieve a similar sound level but potentially release more bhp than the other way round?

[Freeman]

Correct. In general, to increase bhp mod closer to the engine. Header, over pipe, front pipe.

Going full catless will give you a raspy exhaust note also.

[ramiram1984]

I like that A few old timers have contributed to this thread.