I just installed a greddy mx exhaust on my 90 2+2. When i started it up it sounded great, But when i took it for a drive around the block it started to backfire alot. Not just one pop but multiple pops. The only other mod that i have on the car is a Apexi power intake.
it dosen't backfire when i rev it in neutral, or when i am acelerating on the road. It backfires when i try to declerate.
I tried putting the car in neutral after accelerating on the road, but when i put my foot on the break(with the car still in neutral) it starts to make the backfiring sound agin. Is it really my breaks? Or is it my exhaust? Please Help me!!

 

hey masashi, to let you know when i was in japan all the cars that were turbo backfired when decelarating but not a whole bunch of times my like once or twice you might want to check your air to fuel ratio you might be running a little too rich or i could just be retarded but im just leting you know onece or twice is normal (well in japan it was) but if you find anything out please let me know just incase this problem happens to me or others well take care and i hope everything turns out good. laters

90 3zx2 n/a 2+2
7 words feared by all passangers
"hang on I'm going to try something"

 

sell it...and buy a stillen exhaust, they dont pop and have lifetime warranty...although they are expensive