What to tell the exhaust shop.

RustyRatRod said
As for the muffler, take a look at the Dynomax Ultra from Walker. They are said to flow better than an open pipe. Their info is easy to find online. I have the largest one in 2.5" for mine, although I have not gotten to the exhaust on it yet.
Click to expand...

I agree. And testing has shown that Flowmasters don't flow that well. Dynomax Super Turbos flow better than most Flowmasters, and are quieter than the Ultra Flows if that's important. Another chart:

silentpower2.JPG