The Spintechs will be more "raw and in your face" the Maganflows will be more "OEM refined performance"

I'm running 14" Magnaflows with a 3-inch x-pipe

Anything straight through and packed is the way to go IMO... they will have the least resonance, be quietest during light-load, and the best flow.

Borla XR1 (great mufflers in all aspects... unfortunately they are limited for inlet/outlet configurations and they don't make a config to fit my car which is the only reason I'm not running them.)
Magnaflow
Dynomax Ultraflo

Spintechs sound pretty nasty and turn heads-- a couple of my friends run them only for the sound. However, several guys on another message board making big power have made more power switching from Spintechs to straight through packed style mufflers.

I used to run Ultraflo's but they cracked on me and I switched to Magnaflow. I really like them both for sound and quality-- and their case profile being devoid of flat surfaces will be more resistant to bloating/cracking as my Ultraflo's did.

My brother as dynomax ultra flows on his procharged 357 small block. They sound great. When cruisin they are very quite so you can hear the radio :cool:. But when he's at full WOT it sounds like a jet airplane is going by you :lol:

I love my ss magnaflows. I get a lot of complements. Strait threw design.

Well some reason I thought he was, maybe the old motor?. With that said I always had received good comments with my Spintech mufflers on my suburban. My only complaint was trying to hold a conversation on the highway was a bit tough, just depends on what you want.

Just going from what Chicane said in a post about turbos and mufflers.

ive got borla XR-1 with an X-pipe and couldent be happier.

How about Stainless Works, nice quality stuff, sounds good. I believe he has two different mufflers to choose from. Just keep in mind killer loud can get pretty monotonous on the long haul, if you plan on extended cruising.

Rich

Muff
 

Went from Flowmaster to Spintech and lowered interiour noise quite a bit. Also Spintech came in every configuration and were thinner than the Flowmaster. Had a good price too. Talked directly to Spintech.

LS7, Cam, Headers, 3", X pipe, any of these choices will sound great. Cool car.