Chef, if the stock & Greddyare the same 2.5" size, does the Greddy somehow function more efficiently to create better air flow or is it just the sound and the relative power output is the same?

 

Well, I think the GReddy is more efficient. The DP goes straight into a straight-through single muffler then out to the dual exhaust tips. The stock unit actually has two mufflers, the latter being a flattened unit which sits directly under the rear bumper. I have to imagine that the GReddy has a little better flow. They claim that on their website, but I still believe the major impact will be with the DP alone.