Ok, well I guess I'm about ready to make my final decision. Being that I know I don't want to go 3 inches all the way back and I want a dynomax, my only option is for the 2.5 inch dynomax muffler. Being that this is 2.5 inch, my best bet would be to go with a 2.5 inch mandrel bent setup. Going 2.75 inch mandrel or non mandrel is not going to help flow any more air because the muffler is 2.5 inch, but it may give me a lower sound. That would be the only difference.

Does everyone agree or disagree with this? Also, about how much rwhp should I expect adding a 2.5 inch mandrel with a dynomax super turbo? (with my slp cai, whisper lid, kn filter already installed) 5? 10?

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2002 3.8 Camaro M5 Navy Blue Metallic
Y87, Sport Appearance, T-Tops
SLP CAI, K&N, Whisper Lid, Pro 5.0
Kenwood KDC-MP919, Kicker IX405D, Focal Polykevlar 165K2s, JL Audio 10w3-2 Stealthbox