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20 rwhp from cutout

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Old 05-02-2006, 05:57 PM
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I was at the dyno this past Friday and my car only picked up 2 hp over the gmmg. And a friend of mine did not pick up any over a hooker cat back.

Just for your info.
Old 05-02-2006, 07:23 PM
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im keeping my single in single out.....the 427 should sound nasty through those
Old 05-04-2006, 02:46 PM
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I picked up 21 hp and 14 torque with the cutout open on my old setup. This was over a hooker muffler.
Here's the dyno sheet. http://i16.photobucket.com/albums/b3...race/dyno1.jpg

Last edited by fastbird96; 05-04-2006 at 02:52 PM.
Old 05-05-2006, 08:24 AM
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I picked up 60 rwhp with my cut-out. I had a used catback. I was told it was a spintech, but I can't be sure. I went on the dyno after LT's, cam pulley, tb etc and had less power than stock. I was a little freaked out, then we opened the cut-out and picked up 60 hp. I took the pos catback off and put a magnaflow on.

There must have been a collapse in the muffler that was just insane.
Old 05-05-2006, 09:01 AM
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I had a 4" mufflex catback with a Spintech muffler on my old car, It sounded bad *** but I lost 29rwhp and 34ftlbs going through it vs. a cutout.
Old 05-05-2006, 11:16 AM
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i use to have flowmaster (dont know which one, the car had it when i bouth it) but i went from 478/444 to 518/487.. sure enough i was told that flowmaster sucked.. since then i switched to magnaflow which by the way made the car sound not as loud wich was what i wanted but when i redynod to see the difference it was minimal.. i only gaind like 2hp and 10rwtq.. overall iam happy on the switch and would recommend magnaflow
Old 05-05-2006, 03:17 PM
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I got an 80 Flowmaster on mine. I just did my cam. Should I replace it or get a cut-out and if so with what. I really havent researched them much. I will be going to get it tuned in a few week and I guess that will determine what I do with it. I didnt realize how much the flowmasters choked up our LS1's.
Old 05-16-2006, 04:19 PM
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any results from a dynomax?
3" in dual out.
Old 05-16-2006, 05:17 PM
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I gained 2rwhp/2rwtq with cutout open over my hooker...
Old 05-24-2006, 04:31 PM
  #30  
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with the mods in my sig I gained 2 MPH with a cut out
Old 05-25-2006, 08:45 PM
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flowmaster cross chambered mufflers are what chokes.....flowmaster single in single out are great!
Old 05-28-2006, 08:23 PM
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I guess I should be getting a cutout. My car came with a chokemaster. I like how quiet it is, so I'll keep it for daily driving.




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