This problem only seems to affect people who have testpipes (cat-removal) pipes fitted.


Just a little poll to help get to the bottom of who is affected by the rasp/rattle induced by testpipes and how exactly the rasp/rattle can be possibly be avoided.


The rasp, is NOT just audible from the tailpipes, it is also heard from the middle/rear underneath the vehicle and actually at the junction of the Y-Pipe section. It occurs coasting around 2k-3k rpm and when revved at idle when revs fall at the same rpm

Please answer the Poll, then if you feel it will help, detail in a post YES or NO follwed by your exhaust setup. May help get some idea of when and how it occurs

Stock Y-Pipe or aftermarket? Stock or aftermarket muffler/rear section? What brand of Testpipes?

Please try and keep the thread a neat as poss. . .

Jamie

 

NIsmo headers, TurboXS test pipes(unresonated), Nismo Y-Pipe, Nismo catback.

I have a ton of rasp at anything over partial throttle from 2k to 4.5k RPM. Under deceleration I have a lot of rattle between 2.3k RPM down to 1.9k RPM, combined with an odd whisping sound.

 

sorry but when you say backbox what are you talking about.

 

Maybe he meant catback.

 

Backbox, maybe its a UK think but 'rear muffler' is what i meant, 'cat-back', yeah all the same, but catback is abit misleading as if it truely was, the Y-pipe would be changed too. . . .

basically, aftermarket exhaust AFTER the Y-Pipe. . .

 

but then why would he say test pipes, with y-pipe and catback that wouldn't make sense.

is the backbox from the y-pipe back

once again sorry i'm not trying to be an a$$ or anything, i really am not sure what you are talking about

 

YES i have rasp

Fujitsubo Legalis-R (Stainless Steel), Testpipes (non resonated), Stock Y-Pipe

 

Just installed Fast Intentions resonated TP's with Injen SES ti exhaust w/ the magnaflow X-pipe. Very little rasp ( barely noticeable).

 

i have rasp, but i dont mind it

 

I have everything... No rasp. You have a double selection on the poll.

YES, I have testpipes, AFTERMARKET backbox and AFTERMARKET Y-pipe is listed TWICE...

You need a NO I do not have rasp with the above.

 

My setup: DCSports headers, Megan Racing Resonated Test Pipes, Stock Y-pipe, Stock Exhaust.

Here is what I am hearing: http://www.youtube.com/watch?v=Sq6eIQ1z3E8

This is the RPM's where it happens: http://www.youtube.com/watch?v=Y_FMsIDBusQ

Sound has been pinpointed at the Y-pipe. IT IS NOT THE USUAL RASP SEEN WHEN TEST PIPES ARE INSTALLED. It is a shrill squeaky sound. I put the car on a lift. I sat it in and reved it. A friend stood beneith the car and listened to where it was happening.

I am fed up with it tho... Ordered Injen SES exhaust today!

 

I know, im a muppet. . . . . . i just hope other people are clever. . . .. maybe an admin and ammend it?

ADMIN!!!!

 

lol, no problem... I am sure people will figure it out.
Not sure if an admin can fix it... maybe try pm'ing on and asking?