Exhaust Tech -- Best Method to Kill Rasp?

[SimpleStaple]

So currently, I have a full-custom header back exhaust and am suffering rasp right at the peak of each gear. Currently, I am running the following setup, in order.

1. OBX Header (EuroJet Design) with titanium wrap and silicone coating
2. 2.5" Cat-Less mid pipe with custom 'branch' O2 spacers
3. 2.5" Magnaflow resonator (12" length)
4. 2.5" Magnaflow Muffler (12" total length as well)
5. Non-resonated rolled exhaust tips

Currently, I was looking into just putting an ultra-high-flow cat in the mix, going with an either 100 cell or 200 cell setup (2.5" as well, of course) to help, but was hoping I could get some additional ideas and feedback before I being dumping $$ to make things perfect.

Should I just start with highly resonated tips and go from there?

[DerekH]

I'm running a longer res and a shorter muffler with the high flow cat that comes with the ej header. I only get rasp when the engine is cold.

[TylerO28]

You'll probably benefit from a14" resonator and maybe a 200 cell cat. Depends really on what you want. It can't be mellow and loud, can't be quiet and throaty. It's kind of finding that balance. I have the Eurojet exhaust and no cat and have zero rasp...but i also have the best muffler anyone can buy...the turbo...

Many people find test pipe plus Eurojet to be raspy, and they use a14" Res and muffler... So get a high flew cat and it'll prob be perfect

Sent from the bottomless pits of HELL!

[SimpleStaple]

You'll probably benefit from a14" resonator and maybe a 200 cell cat. Depends really on what you want. It can't be mellow and loud, can't be quiet and throaty. It's kind of finding that balance. I have the Eurojet exhaust and no cat and have zero rasp...but i also have the best muffler anyone can buy...the turbo...

Many people find test pipe plus Eurojet to be raspy, and they use a14" Res and muffler... So get a high flew cat and it'll prob be perfect

Sent from the bottomless pits of HELL!

Yeah, the 200 cell is what I was leaning towards.

Def going to order one up soon. Thanks for your $.02!

[TylerO28]

No prob.let us know how it goes. Hope it cuts down on the buzz

Sent from the bottomless pits of HELL!

[Rabbit_2.5]

A longer resonator would do the trick as well. I'm still running the stock exhaust manifold but I have a catless midpipe running into a 24" resonator to a 14" turbo muffler (Imco is the brand) with a twin exit double wall tip. It's not loud but people notice if i get on it and not even a hint of rasp up to 7200.