Stone

I had a single in, dual out with turndowns on my last SCrew. No one in the back seat could hear anything being said in the front. The resonance would literally cancel all sound. lol. The sound was awesome from the front seat though, outside as well. Good low rumble at idle and nice-n-loud at WOT.

Hitech Redneck

Flowmaster will sound terrible if you take your cats out. I had Flowmaster 40s then took the cats out and it sounded like the baffles were about to rattle out. Im running magnaflows now.

Dirtboy

I have the Flowmaster 40 series single in/dual out, straight back with 3" tips and I really like it...I wanted my exhaust to sound aggressive but not extremely loud. This muffler is perfect! Nice deep growly tone. Can't hardly here it on the highway, unless it kicks into passing gear and there is absolutely no drone noise.

I was going to go with the 50 series because I was afraid the 40's would be too loud, but I'm really glad I didn't. Hope this helps.

901screw

Yeah that actually helps a ton, I appreciate it

Carper87

ive got the true dual 40 series on mine love them like everyone said not too loud great sound