Slant six Muffler!

I have a simple 2-1/4" pipe & tail with a Maremont super turbo w/2-1/2" in & out. Don't ask why the large muffler with the smaller pipes, long story. Sounds good for a stock motor & exhaust, and I'm sure my backpressure is close to zero with this.

Im thinking I have not enough back pressure. Like it sucks it back in before the pulse fully clears the tail pipe.

seinfeld idk shrug.gif