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01-22-2011, 09:25 PM #1
Would this set up restrict power any?
Say you had a full bolt on ls1 (LT's,Ls6,Lid,Ported TB) with a cut out before the stock catback on a base or ws6 model. Would it restrict any power at all with the 2.75 piping?
I think it would be funny to have the stock muffler driving around then when a random riced out civic pulls up next to you and wants to run, until you open up that cut outLast edited by Mike0202; 01-22-2011 at 09:28 PM.
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01-22-2011, 11:00 PM #2
Of course there is some to be had with a 3" pipe or even 4". With your mods would you feel that? No. Great way to hide a cam
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01-23-2011, 09:39 AM #3
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01-23-2011, 10:21 AM #4
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2002 Z28 A4 NBM- Sadly now demodded :(
I did almost this exact thing before I went with the TD setup. It was throaty (LT's into a custom Y-pipe into the I-pipe with the cutout under the rear passenger seat) but not loud at all with the cutout closed. Open it up and it was a different matter. Open got another 6 hp and 10 lbs-ft of torque - not as much as before the LT's were installed - then it was almost double) but a world of difference in the sound.
An anecdote: I'm driving (the 02 - see sig) to work and a riced out Civic pulls up next to me at the light. He blips the throttle. I look at him while I open the cutout (electric type for me) and blip MY throttle. I think he pissed his pants a little and he wouldn't look at me. I left the light at a sedate pace and he stayed behind me all the way.67 Camaro: K-K + 797-z (look it up), 454/Th400/4.10 12-bolt = 6mpg, PS/PDB/PW tilt, tach, gauges...
2005 Corvette LS2/M6 Magnetic Red Metallic (What else would it be?) w/ Cashmere interior
2002 Z28: NBM/Tan, MTI smooth lid, smooth bellows, !AIR, !cats, 1-3/4" QTP SS LT's, 2-1/2" TD's with X-pipe, MagnaFlows dumped at axle, custom welded SFC's, MidWest Chassis body mount adjustable T/A, 3400 stall, 3.23 gears (was 2.73). Tuned: 343rwhp/357rwt (before TD's). Best: 12.559 @ 108+, 1.73 60' @ 3500' DA w/MT ET Street DR's.
Carbon footprint? CLOWN SHOE!
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01-23-2011, 04:40 PM #5
I knew quite a few people doing this years ago. It does cost a little power but with an electric cutout it doesn't really matter. Flip of the switch away.
If I were building a sleeper that would be the way to do it. Can't sneak up on anyone, or fool anyone with a loud exhaust system.
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01-23-2011, 04:43 PM #6
You don't need an electric cutout with an lm-1. It's just a resonator in the way.
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01-23-2011, 05:49 PM #7
I say yes no matter what 3 inch system you use,,,it's just one 3 inch pipe and it's not really enough no matter what muffler you use.
You want to keep the single catbacks without the need for a cutout then go to the 4" mufflex. Otherwise a real dual system is the only other option as far as performance goes.
But the real idea behind the cutout that I was aware of in this thread was using it along with the factory catback system, in which case, a catback wouldn't be all that necessary, just flip a switch and bypass the whole thing.
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01-26-2011, 10:27 AM #8
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01-26-2011, 10:39 AM #9
Well it would depend on where you want to put the cutout. Closer to the Y-pipe the better off you'd be.
People report gains on the dyno with the cutouts open, even when they already have an aftermarket 3 inch catback.
I personally have only used the cutouts at the track, never on a dyno before. And I do see gains depending on the car and the system it has.
My whole issue with the 4th gen is taking a 400+ HP engine and trying to funnel all that down into a single 3 inch pipe. It's just not enough.
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01-26-2011, 01:56 PM #10
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01-26-2011, 03:29 PM #11
I've read that one 3' pipe flows as much as dual 2.5's...
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01-26-2011, 03:38 PM #12
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01-26-2011, 03:40 PM #13
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2.5 duals are enough to support about 500hp if I remember correctly
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01-26-2011, 04:42 PM #14
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