Just looked at mine...it is center in/offset out, 3" in and out. Also, you will need about 14"-16" of 3" pipe to cover the difference in length between the huge stock muffler and a Flowmaster. I have the Super 44 and love it. I got mine from www.performancepeddler.com
. They have great prices and super quick (and I think free) shipping. You click on the part you want and submit an offer. Doesn't matter what number you put in, they will email you with their lowest price. The emails are apparently automated and usually come within an hour. Got my stainless Flowmaster 3.5" tip there too. Let us know how it turns out.