alright so i have a complete bone stock JDM GSR B18C and i installed a brand new in the box Megan 4-1 Header and im running a full buddy club cat-back exhuast system with stock cat but now my car sounds like a subaru has a rumble sound to it i dunno what it could be i check for leaks and dont seem to find any but i think it's leaking were the dounut gasket goes would that make it rumble like that???? it's annoying driving it cuase litterally sounds like a suby lol

 

Jack the car up on jack stands and start it up, crawl under and listen/feel for leaks (w/o touching it obviously).

Are you sure it's not missing? Check your plugs/wires/dizzy too.

 

it cant be missing cuase it didnt do this with the stock header just recently when i cnahged them it started doing it im thinking it's becuase a leak sounds like shit IMO lol i'll check it out tomorow

 

i would not advise crawling under your car whuile its running up on jack stands.

 

+10000000...shit I don't like crawling under it on jackstands ANYTIME...much rather use a lift.

 

^^^soft

 

I sleep under my car with jackstands...

While working at Sears Auto there have been MUCH more accidents with cars on lifts than on jackstands; but that's cause Sears had some old ass leaky lifts lol.

 

Leave it alone, Suby's sound !!!