[findog78]

The old exhaust had cheap glass packs with the seams blown out from backfiring so Im thinking its not because muffler is too "free flowing". Its not tricking me either. When I pin it it feels like Im starting of in 2nd gear. Even my kids notice it! Im leaning toward the back pressure scenario with the change to 2.5 diameter? The motor is a mild 350. 9.5CR, cast 1.94 heads, Lunati street cam, performer RPM. Nothing outrageous but not a stocker. I really did a lot of work cutting, splicing, and welding a jog in the collectors so the exhaust would hug the bottom and not hang down as much like the old one. Its really tight and the X pipe fits perfect and its all welded. Im wondering to save the work I did if I could use a reducer after the 2.5 X pipe to a 2.25 mufflers and go out 2.25 tail pipes? Im just reluctant to get the smaller XL magnaflow again and end up with the same thing?