Fast Intentions exhaust is here!

Originally Posted by DannyGT

I am not an expert but I think I might have the 'secret' to the rasp...

First things first...the LTH might resolve it all together because I am sure its going to change the resonance completely because of where the pulses meet etc etc...So they might cure it with that alone.

Second...On almost all G/Z's (including mine) the rasp is at its loudest in the 2-4k range, and can sound different depending if your test/hfc/res test...But one thing that seems to be certain is WHERE the rasp sounds off in the exhaust piping. The location seems to be right BEFORE the X/H/Y location in the exhaust. On mine, you can almost FEEL the sound pinging off the pipes in that area...(before the GTM res test pipes, its no where near as loud anymore)

So - from what I can tell, only one company got it right so far and its that redesigned invidia exhaust where they got those huge resonators in that exact location! Coincedence? I dont know...

I havent really heard anyone with full test pipes + FI exhaust so I cant comment on how much rasp (if any) they are actually experiencing. But I think (hope) the LTH might just cure it complete or throw it off further into the exhaust where FI's current resonators can distrupt it in that area...

Either way - I'm very close to just going with a full FI setup once I see those LTHs!!!

Originally Posted by kannibul

I know it'll change with LTH's, but, how it will change is up for question.

That said, I don't notice ANY rasp. I do hear a lot of low-frequency resonance in the 1.7-2.5K RPM range, but I think that's more of a matter of the natural resonance of the cabin of the car, than anything else.

The second time I drove around with it, it wasn't as pronounced as I remembered.

I also went around to all the speed bumps that I know to see if I hear a "CLUNK" - so far so good! :0