Hi - I noticed there are now 2 cat choices from magnaflow - 23285 - 2x2" in and 2.5" out and 15476 2x2.5" in and 3" out. I think the 15476 is new in their line. The 15476 PN is about $550 vrs about $150 for the 23285. I called Magnaflow and they think the new part is worth an extra 4hp. Tom -

 

yeah, but with that cat and 3" pipes you'll lose a ton of low end

 

no lost here with the 3" out cat into a 3" flowmaster with dual 2.5" out.