wtf? back fire?? - Subaru WRX Forum
 
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post #1 of 5 Old 05-16-2003, 02:45 PM Thread Starter
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wtf? back fire??

i got a 2003 wrx brandnew
have intalled the greddy evo catback on it...
thing is ever since then. if i run on the freeway abit hard and then lift my feet of the gas the car in gear i can hear knocking sound from right under me. it sounds like its coming from where the downpipe connects to the exhaust? o_O

I check under the car i don't see any signs of scratch or dent so the sound is not physical. there is no parts rubbing.

i checked the exhaust tip and the thing have not broke in yet so its still clear no signs of black residue

anyone have same case?
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post #2 of 5 Old 05-19-2003, 07:03 PM
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well you said it...
you installed a cat back

thus you've now opened up the air flow.

did you remove the resonator as well?

if so, now all of the baffled air is flowing freely
the back fire was always there, you just couldnt hear it

this is VERY NORMAL for a modified exhaust.
even my 2.5 RS (n/a) does the same thing

have fun and relax... your car should be fine
that's my bestest guess anyway

if it's not a clanging obvious rattling noise..
it's probably just the exhaust flow you're hearing?

Jamie
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post #3 of 5 Old 05-19-2003, 07:08 PM
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Unless it's the exhaust pipe moving around since it's just on hangers? If that's the case you shouldn't have to worry really unless it's moving around a LOT.

-Franz

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post #4 of 5 Old 05-19-2003, 07:35 PM Thread Starter
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cool
thanks. that reasures me
in the canyons its kinda annoying hehehe
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post #5 of 5 Old 05-20-2003, 03:13 PM
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You've just got a bit more talkative Subie I guess.

-Franz

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