I am thinking about adding another ultra flow muffler in series with my current Ultra flow(straight through). any idea how much this will cut down on noise?

 

Good question! I've got a B&B cat back and it's certainly gotten louder with the headers,cam, and heads. I was thinking of adding something in place of my LT offroad pipes or a free flowing 3" muffler after the Y pipe. Where are you going to put yours? I'm pretty sure I wouldn't pass the noise restrictions at E-Town and I not real thrilled about noisy exhaust anymore.

Steve