first off i have the megan racing test pipe v2...and well im not posting this so i can hear "thats what you get when you buy megan racing blah blah". anyways my dilema is when i let off the gas and the rpm's are whinding down ill hear like a vibration sound. its not like super loud or long, but its enough to bother me. just wondering if anyone else has experienced this and if there any solutions...thanks ahead of time

 

just a little more info that maybe could help...when its whinding down around 2500rpm's is when it makes a quick hiss noise and then the vibration or fart or w.e.

 

test pipes = exhaust farts

 

well the vibration sound i hear cant be fixed?

 

i hope nothings wrong, cause mines do the same thing. i thought it was all part of having test pipes.

 

My theory is it has to do with a your exhaust being too restrictive. I have a customer with test pipes on a Borla, and it makes the same hissing sound on decel when you free rev it. He's upgrading to the Motordyne soon, so we'll see if my theory is correct or just a bunch of crap.

 

oh i seee...so what your saying is, in theory, that my exhuast is too restrictive and the buildup is causing the noise?

 

at least if it was a cool sounding hiss i wouldnt care..lol. but the little vib/fart it does after the hiss is soooo annoying.

 

I have the hissing noise when the revs drop with HFCs paired to stock exhaust but not your other problems. It's normal.

btw, all this talk about vibe and farting is turning me on bb

 

I just installed my Motordyne Shockwave exhaust on my Z with Berk test pipes, and there is zero hissing. Plus, it sounds mean as hell

 

I added Strup test pipes and got the same noise on the stock system. I added a Motordyne XYZ and it was fixed. The Y back is stock, and has no rattles or hissing. I used the base XYZ pipe and didn't need the resonated or catted pipe.

 

had same issue with test pipes and stock system

got a turboxs catback and issue went away now it sounds happy

 

Very possible the noise your hearing is your Y pipe hitting the M brace. Mine did that with the V2 test pipes and a tanabe system. No probs with the V2's on my motordyne system

 

to be honest changing as many exhaust as i have with leaving stock ypipes on. trying to break the bolts loose on the back of the ypipe and some being so rusted i had to use a big breaker bar. it made the flex joins bend more than intened. after that the hiss came. so might be the same thing a lot of people are encountering.

 

The sound you are hearing is normal. I also have the V2 test pipes. It's the infamous "tingy" sound associated with test pipes in general. There are many videos on youtube that will show the sound you are describing.

I got rid of the sound by adding a resonated x-pipe to my X02. Sound is gone.

 

If they're resonated, It's your resonator coming off. Same thing happened to me , eventually get's worse. usually made the noise coming down in revs about 3k..too bad though the design was nice ..execution not so much.

 

naw i dont think its that...i think the hiss is air escaping through the flex area...or what these other guys have said. cuz when i put the pipes on as soon as i backed out and let off the gas it did the noise...

 

watch the video...this is the sound im getting...

http://www.youtube.com/watch?v=IpY3r...eature=related

 

OK but I do not see a “issue?”

 

it is the sound that you hear like a hiss/rattle when rpm are decreasing when letting off the pedal.

i had the same issue with my berk test pipes. same sound. between that and the ses light coming on every 20 miles i took them off and sold them after 2 weeks. i am not goinf with straight pipes agian until i go fi. i tried many thigs to get rid og the sound. i even took it to a muffler shop and had them listen to it while on a lift. the sound appeared to come from the resonator area. people have fixed it by adding another larger resonator, but it wasnt worth that much trouble for me.

you just have to live with it or throw more money at it.