Steve, that's what I was thinking - the LS would change the sound a bit. I've done the Flowmasters, but I want to do something different. Spintech's are at the top of the list... with that said, I'd like a more late model sound. Something like the way Sandlin's Procharged ZO6 sounded at SEMA.
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
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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.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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 . But when he's at full WOT it sounds like a jet airplane is going by you
He's not running turbos (at least for now! ). I've always had good luck with ultra flos.
Jody
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.
Sean, as far as I know spintech is one of the most high flow mufflers around, unless there is something you know that I don't? Which is always possible by the way. But as far as I know, they flow more then most.
Just going from what Chicane said in a post about turbos and mufflers.
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.
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.
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. But when he's at full WOT it sounds like a jet airplane is going by you 
). I've always had good luck with ultra flos.
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