race mufflers??

Old 06-15-2009, 03:18 AM
  #1  
JEFF69Z28
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Default race mufflers??

which is the best?
flowmaster outlaw series or dynomax race mufflers? or some other brand.
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Old 06-17-2009, 04:38 AM
  #2  
chevyfireball
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Best is open headers. I had to put flow masters on my 572 Camaro for a night meeting and it ran like shit.
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Old 06-17-2009, 07:40 AM
  #3  
ARUSSELL
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When I have to run mufflers I have a set of Spin Tech
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Old 06-17-2009, 07:41 PM
  #4  
mr950
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Default 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
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Old 07-07-2009, 11:00 AM
  #5  
russ67chevelle
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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:
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Old 07-07-2009, 12:27 PM
  #6  
shawnp
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Kooks make a killer muffler set up.
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Old 07-07-2009, 01:12 PM
  #7  
radicalz
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I'm running the old style flowmasters....the originals...they have held up well...flowmasters work well...for racing
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Old 07-18-2009, 02:42 PM
  #8  
71
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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!
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Old 07-18-2009, 07:22 PM
  #9  
OneBadGMC
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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).
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Old 07-18-2009, 08:16 PM
  #10  
kwkracing
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Are you racing the truck again Gmc?
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