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The kitty cat is right. Sure you can weld a 2.5" pipe onto the downpipe flange and have 2.5" all the way back to the tips, but the flange is still going to be stock sized. And lets say you hog out the downpipe flange to 2.5", too. Your manifold collectors are still going to be stock sized. So, while adding a larger downpipe-back exhaust WILL help, and moreso than a cat-back, its still not going to help THAT much.
On a side note, my header is shipping out to me from the ceramic coaters today. GLEE!! :banana:
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