Exhaust Leak or just a sound I have to live with?
 

I just installed a set of Berk non resonated test pipes along with my F.I. CBE that Ive had. Under Load Im getting a raspy noise from what sounds like under the car. On deaccelration, it makes a sucking sound...almost like an open wastegate. It doesnt sound like a typical exhaust leak sound so thats why im asking...is this common with tp's? Or do i have a leak?

almost like a hiss??

yes, but not from the rear.

You can check everything over again and make sure there aren't any leaks. Otherwise it's resonance from lack of restriction. A lot of exhausts do that, especially when you had test pipes or high flow cats to the mix.

Normal.

i currently have stillen hfc and FI exhasut and i get the hiss on decel and a hiss on high load accel. i am going to swtich my HFC to FI resonated HFC to try fix it a bit. becaus eon accel the hiss is extremely annoying. and i got my mechanic to look it over and there are no leaks

It's not going to fix it. I had resonated cat pipes and resonated test pipes. You're better off using exhaust wrap, that will minimize it.

Damn that sucks! I mainly work on Z32's and they dont have that problem :/
The sound really is annoying too, do FI's LTH's create that sound also?

Wrap just the test pipes?

Test pipes will definitely rasp a lot like you mentioned. Header wrap around the TP is a good inexpensive solution. Next best thing is look for something resonated if you are still unhappy with it. Regarding headers, they do have a much cleaner sound. My PPE's rasp but with a HFC, it's very minimal now. I haven't really heard any with the F.I. LTH's. Either way, it's an expensive upgrade from TP's to gain maybe 5whp.

What causes the hiss on decel? I only hear it if I'm sitting still and revving it and let off quick-not on the open road. So it really doesn't bother me - just curious. I've got FI resonated CBE and 18" resonated HFCs.

I don't get hissing on decel with my LTH's. Not sure about the F.I. headers. I only get a small hint of rasp, but its masked by scavenging. It might originate from the factory header design, idk, I'm only guessing from my limited experience.

does it sound like this?

^ Yes it does, just reving, on accelaration and decel

Very normal, unfortunately. You could exhaust wrap the test pipes and x-pipe to break some of the resonance. It does work, I've done it on two different exhaust set-ups.

OOOOR, you could just dump the F.I. Exhaust and get the Motordyne Shockwave exhaust with ART Pipes, absolutely no rasp with this combo

I hear a lot of talk about the Hiss on decel and revving but barely any talk about acceleration.

I get it with all three. Its annoying when accelerating hard and you get this hissing/rasp along with the VQ sound. Kind of ruins the whole beauty of the VQ exhaust note. I checked under the car and nothing is hitting anything, checked the exhaust and test pipes for leaks or any loose bolts. Everything is fine so i'm guessing its just the nature of these test pipes.

I'm going to try and Wrap the test pipes and see if that helps.

Some people are partial to the VQ hiss. I find it endearing. YMMV.

I think the "hiss" sounds cool... but that's just me. I have Berk test pipes and they are not leaking...still have the hiss when letting off the throttle.