SVThis

iTrader: (2)

whats the diff...on my 93 Z28 i just swapped the stock muffler with a magnaflow but on my 99 im goin all out and getting the cat-back....my question is will i see more gains by doin the whole cat-back rather than just doin the muffler....if so WHY?

Lithium

iTrader: (47)

It will flow more if you swap the rest of the exhaust, because of the the larger diameter pipes. You will see a little gain, but not a lot.

Redneck Z

iTrader: (3)

Magnaflow claims about 5 extra rwhp on an LS1 with the catback vs. muffler. The easy answer is it's larger and flows more air. Less back pressure is a good thing. I've had the magnaflow muffler and the catback, and the catback sounds alot better also.