| Engine and Transmission Discuss Engine, Transmission, and all other performance modifications here. |
10-04-2006, 09:33 PM
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#1
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Firebird Guy
Join Date: Dec 2004
Location: Westminster, Colorado
Posts: 6,590
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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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1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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10-04-2006, 09:58 PM
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#2
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AF Enthusiast
Join Date: Jun 2005
Location: Salem, Virginia
Posts: 635
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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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'91 RS, forged LT1, GTP heads, blower cam, AFR Hydra-Rev kit, ram air intake, SLP 1 3/4 headers and 3" y-pipe, 3" Dynomax exaust, Yank 2800 TT stall converter, Strange 3.73 gears with Zexel-Torsen LSD, ect, ect...
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10-04-2006, 10:05 PM
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#3
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Firebird Guy
Join Date: Dec 2004
Location: Westminster, Colorado
Posts: 6,590
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Re: Cutouts or duals
248/254 at .050
629/622 lift
113 LSA
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1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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10-04-2006, 10:19 PM
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#4
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That thing got a Hemi?
Join Date: Jul 2004
Location: London
Posts: 9,301
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Re: Cutouts or duals
Straight-through sidepipes!
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Seatbelts Saved My Life
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10-04-2006, 10:56 PM
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#5
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AF Enthusiast
Join Date: Jul 2004
Location: why?
Posts: 1,985
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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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10-04-2006, 11:00 PM
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#6
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Firebird Guy
Join Date: Dec 2004
Location: Westminster, Colorado
Posts: 6,590
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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.
__________________
1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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10-05-2006, 05:43 PM
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#7
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AF Enthusiast
Join Date: Mar 2005
Location: stone mountain, Georgia
Posts: 1,543
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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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car audio guru... 
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10-05-2006, 10:54 PM
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#8
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AF Enthusiast
Join Date: Jul 2005
Location: Orlando, Florida
Posts: 1,364
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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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92 z28 camaro 5.7 TPI
current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace
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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10-05-2006, 11:06 PM
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#9
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Firebird Guy
Join Date: Dec 2004
Location: Westminster, Colorado
Posts: 6,590
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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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1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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10-05-2006, 11:11 PM
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#10
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AF Enthusiast
Join Date: Jul 2005
Location: Orlando, Florida
Posts: 1,364
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Re: Cutouts or duals
yeah i guess you're right
__________________
92 z28 camaro 5.7 TPI
current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace
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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10-06-2006, 12:35 AM
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#11
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AF Enthusiast
Join Date: Jul 2004
Location: why?
Posts: 1,985
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Re: Cutouts or duals
Quote:
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Originally Posted by Mr. Luos
Not worried about performance with the cutouts closed.
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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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10-06-2006, 02:32 AM
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#12
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AF Fanatic
Join Date: May 2004
Location: Tenafly, New Jersey
Posts: 4,697
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Re: Cutouts or duals
You've got HP Tuners right? is the exhaust bang bad enough to cause false KR?
__________________
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
01 EX250 - still gotta get my license for this thing
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10-06-2006, 07:27 AM
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#13
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Firebird Guy
Join Date: Dec 2004
Location: Westminster, Colorado
Posts: 6,590
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Re: Cutouts or duals
Quote:
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Originally Posted by Savage Messiah
You've got HP Tuners right? is the exhaust bang bad enough to cause false KR?
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At idle we think it has.
__________________
1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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10-06-2006, 01:58 PM
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#14
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AF Fanatic
Join Date: May 2004
Location: Tenafly, New Jersey
Posts: 4,697
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Re: Cutouts or duals
yea that's what I figured... that's bad lol
cutouts
__________________
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
01 EX250 - still gotta get my license for this thing
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10-13-2006, 04:28 PM
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#15
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AF Regular
Join Date: May 2005
Location: Tuckerton, New Jersey
Posts: 256
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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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