MrFairlady

Ok so I'm Driving my Nissan a tad more lately and With a Kid on the way (highly doubt She will ride in this car) but damn...All of a sudden Theres a Ton Of exhaust Fumes in the cabin if the window is down or somewhat Cracked open.

:::::Run down on the cars exhaust is a basic 3" Dp,test pipe and Basic canister exhaust.All Gaskets Used at the flanges.

Now,This car was originally gonna be a Track only car so all the Sound deadening is Gone (use to be Gutted & no rear trim/carpet but thats all about back including carpet),and I do remember removing the rear cabin pressure flap near the tail lights/rear bumper area. I'm wondering if thats it?Still No trunk area flooring in the very back.

windows Up The smell is fine and Not a problem.This is not my 1st S13 nor is it my 1st Modded car (test pipes etc etc).
Any ideas other than an Exhaust leak ,Which I'm sure Its not?
My Last Hatch did not have this problem.

any ideas how to test for an Exhaust Leak.? Smoke machine make it Show Up if it is??? Should I maybe run a High flow cat or something?

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