I will ASAP! I put down 515hp and 540 lb-ft through the "lil" 2 1/2 in MAC Cat-back. Oh sorry that was w/ a 20 shot sprayed at 4500 rpms. Talk about a wierd Dyno Graph! lol Ill Post results off the spray and on the Spray. be Saturday Morning if the damn exhaust will ever get here! I gotta admit, i have heard Bassani, MagnaFlow, and Flowmasters on 03's and The Mac is by far the LOUDEST!