Curious. I've heard a bunch of people talking about "loud Spintechs". I'm running them on my build. A bit over 600hp, 11:1 compression, 3" exhaust all the way from the headers, through the X-Pipe, through the tail pipes. It's even a convertible. It gets maybe a little loud at WOT, but not what I'd consider real loud. Mine are the short ones sold by Ram Air Restorations. They're a 12" case built to Ram Air's specs. They're similar to the Sportsman 3000 I believe.

I really like the sound of the Magnaflow's with 3" pipeson my 69 with the LS7.
Reasonably quiet at idle but sounds great at WOT.:thumbsup:

I have been through about six exhaust systems on my car over the years with about the same number of mufflers. Just never found anything that was different sounding, but just right. My current system is the one I am finally happy with. It's an x pipe, 2.5" pipes into Dynomax bullets, and tailpipes to the bumper. It's got a rumble, but a clean 60s kinda sound and is very streetable (even though Dynomax says they are not legal). It's also quieter than my flowmaster system. I still have the cutouts on it for track fun. I'll be doing the same system on my Chevelle this year.

magnaflow's

3" full system with H pipe
800+ HP BBC

Love the sound at idle and WOT

i tried the Dynomax VT muffler on the Nova,with 3" and an X pipe i always liked the sound of the dynomax on the 5.0L Mustangs, these have the flapper in them supposed to be quieter at idle and cruise and then open up at WOT but i find them a little too loud at cruise, they have a really good sound to them not a raspy as a Flowmaster and a bit deeper than a magnaflow. i have always liked magnaflow in the past, but i think i am going to change these ones out for a old school Dymomax

.02

Dynomax bullets, x pipe, dumped before the axle. LOUD and NASTY.