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Jan 13, 2005 | 07:15 AM

LS1shark

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Cut-out

Hi guys I heard that the CUT-OUT is not good with the Long Tube Headers because the ls1 engine need some Pressure in it Do this is right ??

THANK

Jan 13, 2005 | 09:58 AM

99FormulaM6

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From: Virginia Beach, VA

people run cutouts all the time, havent heard of too many backpressure problems. i have lt's and true duals, and theyre as free flowing as a cutout and i dont have any problems

Jan 13, 2005 | 11:23 AM

luv2spd

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From: Newton, KS

Its not a problem. I just got a cutout welded in and didn't notice a loss of lowend over running through my muffler....its much louder though!

Jan 13, 2005 | 12:18 PM

ZR2877

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From: Ga

I had LT with a cutout and the only problem was the awful sound.

Jan 13, 2005 | 12:39 PM

tim99ws6

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From: Nashville, TN

nope, Only need 6" of piping from where the primaries merge(beginning of the collector) to where you're exhaust dumps(cutout) to be sufficient for backpressure...

Jan 13, 2005 | 09:47 PM

Joker # 9

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My brothers SS has a cut out at the end of each of his headers, performs significantly better with them open, track and dyno proven!

Jan 13, 2005 | 10:05 PM

boosted03cobra

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From: houston

Quote:

Originally Posted by ZR2877

I had LT with a cutout and the only problem was the awful sound.

that was my problem to

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Jan 14, 2005 | 11:42 AM

Uno99

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From: Appleton Wi

The sound on stock manifolds is not too bad.

Jan 15, 2005 | 09:33 AM

#10

M6HuggerSS

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From: San Diego, CA

i have FLP long tubes, NO CATS, and my numbers went from 380rwhp 360rwtq (closed)
to 400rwhp and 375rwtq (open) it was hard to beleive because it reals faster with it closed.... its DAMN loud when open!!!.... sounds AWSOME at low speed and idle....

Jan 15, 2005 | 09:54 AM

#11

Vertigo

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From: Winchester,VA

i believe there is a loss of tourqe below 2500 RPMs with the cut-out open...but once you get up in the higher RPMs the gas flows much better so it can tac out and accelerate easier... I could be totally off on this but this is what i've heard...

Jan 15, 2005 | 10:05 AM

#12

M6HuggerSS

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From: San Diego, CA

cut out CLOSED OPEN
2500 rpm- 275rwtq 300rwtq +25
3500 rpm- 320rwtq 350rwtq +30
4500 rpm- 340rwtq 370rwtq +30
5000 rpm- 350rwtq 375rwtq +25

sorry, most of my dynos started at 2300-2500.... but there was NO loss in torque.....

Last edited by M6HuggerSS; Jan 17, 2005 at 07:00 PM.

Jan 15, 2005 | 12:36 PM

#13

2000WhiteTA

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From: Allen/Denton

The only issue I had was listening to the noise which sucked. I didnt like how the car sounded with the cutout open. With stock manifolds it will not be so bad.

Jan 15, 2005 | 02:56 PM

#14

tim99ws6

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From: Nashville, TN

That's because the tq is pushed down in the curve, therebye making the car "feel" and rev quicker. But make no mistake, the car will always be a faster CAR w/ a open cutout....it's a matter of the driver driving it right....

Jan 16, 2005 | 11:27 PM

#15

Zach@Texas-Speed

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From: Lubbock

i've had a cutout on for 2 years....i had it open all the time before headers...not so much with headers....hardly ever with the cam, its just too nasty