race mufflers??
 

which is the best?
flowmaster outlaw series or dynomax race mufflers? or some other brand.

Best is open headers. I had to put flow masters on my 572 Camaro for a night meeting and it ran like shit.

When I have to run mufflers I have a set of Spin Tech

Race mufflers
 

I run Dyno-max race magnums, only picked up 2 hundreths ,between mufflers on and open headers.Must flow pretty darn good! Mind you that was on a 10.1-1 compression BBC. I think the more compression, the better the motor will like open headders. I.M.O. under 12.5-1 compression, motors like some back pressure. These ar pretty quiet mufflers till wide open throtle, unlike them noisy Flowmasters

my homemade bullet mufflers with 1/2" perferated holes in a 3"pipe will be tested on and off car.taking car to chassis dyno on july 19.will keep info posted.....oh the engine is a 10.2:1 compression 572.286 296@ .050 .748" lift-i will take engine north of 7000 rpms :shock:

Kooks make a killer muffler set up.

I'm running the old style flowmasters....the originals...they have held up well...flowmasters work well...for racing

Flowmaster should be taken to court for false advertising. Worst perf. muffler on the market. I use magnaflow race mufflers on my chevelle. 4" straight through stainless mufflers w/ x pipe. 540 w/ 15:1 comp. and haven't been bothered by the cops yet on the street. At the track it runs the same with or without exhaust. Pay a little more now and be happy for years to come!

http://www.youtube.com/watch?v=QIz2bSo8ScY

Yeah, Flowmasters are junk. :roll: I'm only making about 1600 crank HP through 4.5" Top 10s (probably more than that given the issues on that pass).

Are you racing the truck again Gmc?