for the sound my vote would be Flowmaster...for performance....my guess is dynomax...probnably has a pretty good sound

if i had to choose which i already did for my dads truck...go with Magnaflow....the best of both worlds

 

I have a Flowmaster 70 Big Block muffler, single-in, dual-out the passenger side. No resonance, but a healthy sound when accelerating. Barely any sound at cruising speed. Overall, I am pleased with this muffler. I removed a Gibson that resonated everywhere between 1600 and 2200 RPMs. I will never buy another Gibson.

Good luck with your decision.

 

I would say flowmaster has the best sound and magnaflow has the best performance

 

not really mac. My dyno max bullet muffs run a hell of alot better then those shitty flows and magna. just my .02 btw i have true duals with a off road x pipe.