which low profile muffler behind a 426 racing HEMI ?
#1690673
10/26/14 09:09 AM
10/26/14 09:09 AM
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Joined: Aug 2010
Posts: 208 Munich, Bavaria
docford
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enthusiast
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OP
enthusiast
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Posts: 208
Munich, Bavaria
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I need to rethink the muffler system on my Hemicuda racecar, as it hits the ground on the Nurbrugring way too often. What low profile muffler would you recommend behind a HEMI that revs up to 7,500 rpm ? Which mufflers flow the most ? We currently have Borlas with 3" inlet and outlet and a pair of Supertraps exiting both on the right side of the car, but they are both too low. I'd like to put the muffler under the rear seat and then exit at each side without using the Supertraps anymore, but just an oval 3" stainless steel tube. To achieve that, the mufflers need to reduce sound more than the current ones, but without affecting flow. Any idea is welcome
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Re: which low profile muffler behind a 426 racing HEMI ?
[Re: docford]
#1690674
10/26/14 11:43 AM
10/26/14 11:43 AM
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Joined: Jan 2003
Posts: 2,933 A shed in England
Tig
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A shed in England
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Do you have a crossover pipe? if not that will help a little. Lengthening the pipe will help a little as well. Can't comment on which muffler would be best though. Borla's are reckoned to be one of the best IIRC. Dynomax as well. Do you have a db limit to adhere to? Edit: Found this but principle is the same. http://www.pontiacstreetperformance.com/psp/exhaust.htmlHTH's
Last edited by Tig; 10/26/14 11:49 AM.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: which low profile muffler behind a 426 racing HEMI ?
[Re: autoxcuda]
#1690677
12/06/14 07:41 PM
12/06/14 07:41 PM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
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top fuel
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Metro Detroit
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Any pics of the car at the 'ring?
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: which low profile muffler behind a 426 racing HEMI ?
[Re: OUTLAWD]
#1690678
12/06/14 08:46 PM
12/06/14 08:46 PM
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Joined: Jan 2003
Posts: 7,498 Minnesota
Hemi_Joel
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Minnesota
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Dynomax Ultraflow SS. Straight through muffler that does not effect power. they are quiet at idle, but they do tend to make some noise behind a healthy Hemi. You can get them in a size that should fit under the back seat.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: which low profile muffler behind a 426 racing HEMI ?
[Re: Thumperdart]
#1690684
12/06/14 09:37 PM
12/06/14 09:37 PM
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Joined: Jan 2003
Posts: 7,498 Minnesota
Hemi_Joel
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Minnesota
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Quote:
Quote:
Dynomax Ultraflow SS. Straight through muffler that does not effect power. they are quiet at idle, but they do tend to make some noise behind a healthy Hemi. You can get them in a size that should fit under the back seat.
Are those the round ones?
They are available round or oval.
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Re: which low profile muffler behind a 426 racing HEMI ?
[Re: Hemi_Joel]
#1690685
12/06/14 09:38 PM
12/06/14 09:38 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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I Live Here
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State of confusion
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Cool.............do they come in 3 1/2"...............?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: which low profile muffler behind a 426 racing HEMI ?
[Re: Porter67]
#1690689
12/06/14 10:07 PM
12/06/14 10:07 PM
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Joined: Jun 2014
Posts: 5,183
Porter67
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