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Automotive Forums > Chevrolet > Camaro > F-Bodies (Camaro and Firebird) > Engine and Transmission - Cutouts or duals
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Old 10-04-2006, 10:33 PM   #1
Mr. Luos
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Cutouts or duals

Alright....

Seriously considering this option right now.
I have true duals that are non-mandral bent through magnaflow mufflers. High powered N/A 402ci. Makes 523 RWHP through that current exhaust and a 9".
Anyways...I know there is more.

My biggest problem is that the duals fit so tightly through the torque arm bracket that it bangs at idle. Sometimes pretty bad. Cam is a little big so the exhaust rocks with the lope.


This is what I am considering...
Running duals 3" cutouts about 12" off each collector, then running a single 3" pipe to that back through the same mufflers.
Not really concerned with HP numbers on the dyno...but I am concerned about track numbers.

Discuss please!!!!
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Old 10-04-2006, 10:58 PM   #2
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Re: Cutouts or duals

Pros:
Should flow better and gets rid of the rattling.

Cons:
Tamer sound for daily driving.

I say go for it. If you don't mind what are the specs of your cam, I've been wondering for a while?
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Old 10-04-2006, 11:05 PM   #3
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Re: Cutouts or duals

248/254 at .050
629/622 lift
113 LSA
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Old 10-04-2006, 11:19 PM   #4
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Re: Cutouts or duals

Straight-through sidepipes!
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Old 10-04-2006, 11:56 PM   #5
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Re: Cutouts or duals

With those HP numbers I'd be more worried that going back to a single 3" might put a restriction on the engine and cause fuel/air flow problems on the upper end. If you go that route, only use mandrel bends, keep the radi of the bends as large as possible and avoid 90* bends where ever possible. That will help keep restrictions to a minimum
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Old 10-05-2006, 12:00 AM   #6
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Re: Cutouts or duals

Of course it would cause a restriction. That would kinda be some of the point. A tamer street set-up then open the cutouts for track, dyno, etc.

Not worried about performance with the cutouts closed.
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Old 10-05-2006, 06:43 PM   #7
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Re: Cutouts or duals

just cut it off at the headers man! or where the crayon stops melting
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Old 10-05-2006, 11:54 PM   #8
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Re: Cutouts or duals

i have always liked the true duals with an x pipe that dumps before the axel. You just have to have the ground clearance for it.
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Old 10-06-2006, 12:06 AM   #9
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Re: Cutouts or duals

That is fine and dandy if I didn't have the rear cover of a Trans Am.
Dumps is fine with a Camaro, but the Trans Am has the cover made for exhaust tips.

Should have the cutouts ordered by Sunday.
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Old 10-06-2006, 12:11 AM   #10
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Re: Cutouts or duals

yeah i guess you're right
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waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers
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Old 10-06-2006, 01:35 AM   #11
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Re: Cutouts or duals

Quote:
Originally Posted by Mr. Luos
Not worried about performance with the cutouts closed.
I'm not referring to performance loss, I mean loss of driveability. Every exhaust system has some restriction, we're talking about restriction to the point where it severely affects the engine's ability to breathe. Now, if you had a skimpy 2.25" dual exhaust on it and were to go to a 3" single you'd actually see gains in exhaust flow. but if you have dual 2.75-3", you are going to suffer a loss going to a single 3", hard to say how much though.
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Old 10-06-2006, 03:32 AM   #12
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Re: Cutouts or duals

You've got HP Tuners right? is the exhaust bang bad enough to cause false KR?
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Old 10-06-2006, 08:27 AM   #13
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Re: Cutouts or duals

Quote:
Originally Posted by Savage Messiah
You've got HP Tuners right? is the exhaust bang bad enough to cause false KR?
At idle we think it has.
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Old 10-06-2006, 02:58 PM   #14
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Re: Cutouts or duals

yea that's what I figured... that's bad lol


cutouts
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97 Camaro - 2.077 60', 14.745 @ 92.20 - still down, one year later.

194k miles-160* thermo-V8 shocks/springs (V6 rear springs)-3" Magnaflow !cat (3" dynomax bullet) back-SLP CAI-stock boxed LCAs-poly tranny mount and torque arm bushing-custom HPTuners tuning-4.10s/eaton/TA girdle-3.5" alum DS-spohn LCA brackets-prostar skinnies

179.75 RWHP, 204.52 RWTQ

ON ITS WAY: MORE

R.I.P. Andy

87 Benz 190e - DD

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Old 10-13-2006, 05:28 PM   #15
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Re: Cutouts or duals

i dont have a lot of experience with late model camaro exhaust but i have seen many different combos in magazines and many remain a single exhaust even with extreme engine configurations.i cant see a single 3" being a big issue, thats a big pipe.and if im not mistaken isnt one side of the tailpipe a straight thru, not passing thru the muffler?
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