These engines aren't designed to run on very little or no back pressure. if you had a more aggressive cam and did some other mods then it would run better on no back pressure. thats what i have been told anyways and my friend cut his muffler off on his blazer and lost some power so i know its true.

 

no, im going with a muffler, but the magnaflow ones arent really restrictive. im just wondering if i should cut the cat out too, or add a resonator instead, or just straight the pipe right out.

im not after power... just that annoying noise under the hood to go away without shutting the engine off. lol

 

I like the sound of the flowmaster 40 series on these trucks....not real loud (with a CAT still installed at least) and almost sounds like a mini v8 at idle, but doesn't sound like a tiny little buzzy v6 when giving her some pedal either. Just my .02

 

x2 on the 40 series.

 

thing with magnaflow for me is the cheapest of cheap prices.

for my old lumina z34, i had a 3" pipe to a 5" resonator about 10" long, then a y pipe, two magnaflow mufflers and tips as well, all installed, bent and welded for $200.