UEL + OP + Catted FP + OEM catback = abnoxious rasp?

[FR-S Matt]

Originally Posted by whataboutbob

^^ sounds great to me

Now lets add an aftermarket JDL UEL to the mix:

[ame="http://www.youtube.com/watch?v=QrR42x_MVIs"]JDL UEL catless header + Nameless Full 3" Headerback Exhaust - YouTube[/ame]


OH GOD! It's mean, but if I had a Go Pro I'd do exterior driving vids. It sounds a lot like Moto Mike's JDL when you get on it.

[whataboutbob]

Originally Posted by FR-S Matt

Now lets add an aftermarket JDL UEL to the mix:

OH GOD! It's mean, but if I had a Go Pro I'd do exterior driving vids. It sounds a lot like Moto Mike's JDL when you get on it.

FAP FAP FAP .... where's that credit card?

[FR-S Matt]

Originally Posted by whataboutbob

FAP FAP FAP .... where's that credit card?

lmao.

[GT 86 Brah]

more headers!!

[ame="http://www.youtube.com/watch?v=Z4Xn9ym4MkQ"]Headers FR-S BRZ GT86 Subaru rumble catless fly by - YouTube[/ame]

[TheseColorsDontRun]

Originally Posted by sw20kosh

I have put on this combo temporarily and was shocked to find out that the muffler is terribly failing to muffle the exhaust properly. It is silent at idle but when I give it some revs or load, it gets ugly: loud rasp.

Someone said the baffling in the muffler is not designed to handle the increased sound.

Anyone else have this experience? It is so loud that I almost feel like something is wrong with my muffler (yes I checked for exhaust leaks).

I have this exact set up, no obnoxious (to me) rasp.

[ame="http://www.youtube.com/watch?v=5PwhKrqKUSI"]Subaru BRZ Borla UEL, Perrin over pipe, Tsudo catted front pipe, stock cat back. - YouTube[/ame]

[ramiram1984]

I'm sitting in meeting can't listen to vids :/

[ARK Performance]

If you're running the stock cat-back it'll tend to cause restrictions and with an opened set up in the front it'll cause a disruption in the flow making that weird raspy noise, best way to fix it is to get an actual aftermarket cat-back, hope this helps

[mad_sb]

Originally Posted by FR-S Matt

Yeah, I just watched a video of a full Perrin 3" with a Borla UEL. Still had rasp. Son of a....

Oh my stock header went straight to the trash can. That thing is possessed. Looks like the only solution would be going back to 2.5" BUT.....

I'll let the dyno make the decision for me. I'll be dynoing my car soon, and if it throws up good numbers with the JDL UEL and the full Nameless 3", then it will sway my decision easily. This is my first big diameter exhaust, even larger than my LS1 Camaro, lol. I'll just wait and see what happens. Worst case scenario, someone will buy this full Nameless system off of me probably for what I paid for it.

my setup is raspy on 2.5" I have fa20 catted header, nameless over / front pipe, ft86speedfactory single exit with varex muffler. I think these cars really need a lot of resonator to kill the rasp once you put headers on. I have 2 cats and they do NOT prevent rasp with my setup. Swapping out the nameless for a motive over pipe and hks resonated front pipe to see how that changes the rasp. Volume is not an issue since i have the varex, i can close it if it gets too loud, but the raspy honda sound keeps me from driving with it open unless i am at the track or in the mountains

[sw20kosh]

Before I put the stock cat-back back on I had two large magnaflow resonators in the mid-pipe and two magnaflow mufflers in the rear. 0 rasp.

Looks like the stock muffler is not suitable for these flow levels.

I think this is also compounded by the fact that the innovate supercharger requires a ton of timing retard and the exhaust cam is opened up earlier than NA in the lower rpms.

@CSG Mike I do remember robi's setup sounding similar. Rediculous rasp. I thought it was his header that had exhaust leaks that was making the noise.

[FR-S Matt]

Originally Posted by mad_sb

my setup is raspy on 2.5" I have fa20 catted header, nameless over / front pipe, ft86speedfactory single exit with varex muffler. I think these cars really need a lot of resonator to kill the rasp once you put headers on. I have 2 cats and they do NOT prevent rasp with my setup. Swapping out the nameless for a motive over pipe and hks resonated front pipe to see how that changes the rasp. Volume is not an issue since i have the varex, i can close it if it gets too loud, but the raspy honda sound keeps me from driving with it open unless i am at the track or in the mountains

I think I'm going to try a Q300 with an invidia catted front pipe since they're 2.36" in size. Probably get a coated JDL overpipe to match my header and live with that. I'll shelve the Nameless system for turbo later. 1 cat, and 2 resonators plus mufflers is not enough to tame the rasp in a 3" setup. The Q300 is one of the quietest systems there is and knowing how my header is, I think that is what I want.

[PoWn3d_0704]

So... I've got the catted 3" front pipe and the 3" resonated catback from Perrin.... Should I stay away from an uncatted header? I love the sound the Perrin system is giving me, but I don't want any drone or rasp... ever.

[FR-S Matt]

Originally Posted by PoWn3d_0704

So... I've got the catted 3" front pipe and the 3" resonated catback from Perrin.... Should I stay away from an uncatted header? I love the sound the Perrin system is giving me, but I don't want any drone or rasp... ever.

Yes, I would. It will introduce rasp due to the size of the piping.

[Sportsguy83]

Originally Posted by sw20kosh

Before I put the stock cat-back back on I had two large magnaflow resonators in the mid-pipe and two magnaflow mufflers in the rear. 0 rasp.

Looks like the stock muffler is not suitable for these flow levels.

I think this is also compounded by the fact that the innovate supercharger requires a ton of timing retard and the exhaust cam is opened up earlier than NA in the lower rpms.

@CSG Mike I do remember robi's setup sounding similar. Rediculous rasp. I thought it was his header that had exhaust leaks that was making the noise.

What magnaflow mufflers did you have in the rear?

[SirBrass]

Will the UEL headers help cancel out some rasp due to the unequal exhaust flow into the collector?