If I do a nice 2nd, 3rd, 4th or 5th gear pull, I always get a smell of gas and/or exhaust immediately afterwards for about 20 seconds. It seems that

There are no exhaust leaks.
My exhaust tip out far enough so the exhaust should escape past the rear bumper.
The fuel pump cover is sealed and bolted up.
I relocated my valve cover breather to down behind the headlight.
My blow off valve is now relocated down behind the headlight too.

I thought about hooking up my shop vac to the interior somehow and pulling vacuum on it and then using some type of smoker or fogger to see where it enters the car, but I don't really have access to one and they are quite expensive.

If I keep the windows up and sunroof closed, I don't get any exhaust smell whatsoever.
Any ideas on what I am missing?

Check out my ka24de swap wire guide here

I even replaced that weather stripping with a thicker piece to seal against the back of the hood, so no vapors should be coming from the engine bay directly into the vents.

Anyway, if you do, get it recirculated into your downpipe.