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      10-17-2013, 08:12 AM   #1
dapz325
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Electric cut out exhaust

So I have been thinking of doing a muffler delete but the videos got me worried. I like to be stealth sometimes but other times I would love to hear the exhaust note more. I thought why not have them both with an electric cut out system . I would probably have to put two of them on and at around $200 a piece plus the cost of installation would it be worth it? Where would be the best place to put them? I don't want to spend to much money on a set up. There are soooooo many different set ups but video recordings don't to any justice . If i decide not take this route i would like to change the mufflers to give a tab bit louder sound. Before i get all these Whats your opinion on a cheap set up?

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      10-17-2013, 09:04 AM   #2
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Cutouts are going to make it loud as f*ck! As far as where to put them...unless you want crazy amounts of rasp, you're going to need to place them at a particular distance, or multiple of that distance from the engine. If you google "how to get rid of exhaust drone" there is a very informative thread on the markIV supra forums with the equations needed to properly place resonance tubes for the same thing. Just read through the first post and your questions should be answered.
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      10-17-2013, 10:58 AM   #3
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It's on an M3 but I would try to mimic that.
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      10-17-2013, 03:23 PM   #4
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Quote:
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It's on an M3 but I would try to mimic that.
If you are going to dump for performance shouldn't it be as close to the turbo as possible? Why put it back by the mufflers?
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      10-17-2013, 07:30 PM   #5
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Quote:
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If you are going to dump for performance shouldn't it be as close to the turbo as possible? Why put it back by the mufflers?
That's what I was thinking , at least before the cats for I could see some kind of gain. This might be a dumb question but I tried to google it but couldn't come up with anything. Would it have any negative effects if i just modified one exhaust pipe. Leave one stock and open the other when i want to have a little bit more grunt. Doesnt seem like there would be but maybe someone other knows something I dont. Thanks for all the replies
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      10-17-2013, 10:48 PM   #6
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For best performance you want it as close to the turbo as possible. Right after dp's would be ideal. Less back pressure, more flow, faster spool. I had this setup on a big turbo 1.8t about 10" after the turbo. It was good for 15whp vs full 3" turbo back exhaust.
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      10-17-2013, 11:21 PM   #7
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You could get creative and use the signal going to the stock exhaust flap to control them. That would be interesting! Quiet start up when cold and low cruising, but then opens up under load.
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      10-17-2013, 11:45 PM   #8
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Quote:
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You could get creative and use the signal going to the stock exhaust flap to control them. That would be interesting! Quiet start up when cold and low cruising, but then opens up under load.
Never even crossed my mind! genius! then I can just use jb4 control to open and close it!
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      10-17-2013, 11:46 PM   #9
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Never even crossed my mind! genius! then I can just use jb4 control to open and close it!
Bingo!
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      10-18-2013, 08:51 AM   #10
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Just wanted to add cutouts are Notorious for getting stuck. I wouldn't use them myself on a DD.

Also the cost to install two reliable cutouts right after the stock downpipes is slightly on the high side for the gains...probably looking at $250 per cutout + $50 each installed assuming there is space and no modifications have to be made...I guess the easiest would be go with the 3.5 VRSF and just dump right off that for space reasons.

I don't know if they HP gains are worth it, but having it controlled via engine rpm or throttle position would be fucking SWEET.
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      10-18-2013, 12:14 PM   #11
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I have had electric cutouts for about a year now. exhaust note has progressively gone louder as the cutouts do not seal all the exhaust gases. still a great DD, no drone just a bit louder than OEM overall.
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      10-18-2013, 12:16 PM   #12
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with cutouts open, car does feel faster based upon butt dyno. feels similar gains as I got from downpipes.
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      10-18-2013, 12:17 PM   #13
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Quote:
Originally Posted by Torgus View Post
If you are going to dump for performance shouldn't it be as close to the turbo as possible? Why put it back by the mufflers?
If possible you could dump earlier but the OP's request was he didn't want to a do a muffler delete but wanted cut outs to mimic them. (atleast that is what I gathered).

So this is the equivalent to a muffler delete with electric cut outs as they are right before the mufflers.

Sky is the limit if you have the clearance. Dump them after the turbo's for the most power gain but I'm not sure how feasible that is on this particular platform.
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      10-18-2013, 04:03 PM   #14
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Quote:
Originally Posted by akotten
You could get creative and use the signal going to the stock exhaust flap to control them. That would be interesting! Quiet start up when cold and low cruising, but then opens up under load.
Or you could just use a boost activated cutout like this one:
http://www.spracingonline.com/spblog/?p=131

No motors to replace, etc.
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      10-18-2013, 08:47 PM   #15
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I have cl dps and sec cat delete,stock resonator in place and muffler delete n left flap on the driver side.
It's sounds great,there is some drone around 2700 rpm but it's honesty not that bad
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      10-21-2013, 11:16 AM   #16
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Quote:
Originally Posted by longliven54 View Post
I have had electric cutouts for about a year now. exhaust note has progressively gone louder as the cutouts do not seal all the exhaust gases. still a great DD, no drone just a bit louder than OEM overall.
Where are they placed?
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      10-21-2013, 11:19 AM   #17
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Would it be safe to only alter one side of the exhaust or would that have negative effects?
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      10-21-2013, 11:31 AM   #18
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Quote:
Originally Posted by FCobra94 View Post
Or you could just use a boost activated cutout like this one:
http://www.spracingonline.com/spblog/?p=131

No motors to replace, etc.
I like the idea of wiring it up to a solenoid. Then you can put it on a switch.

The corvette and some other platforms use a similar system.

I have a remote switch on mine so I can open it on the fly.

Quote:
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Would it be safe to only alter one side of the exhaust or would that have negative effects?
You wouldn't have equal flow for both turbo's.
I'm not sure how "bad" it really is but it's definitely not ideal from a performance standpoint or balancing exhaust gasses.
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      10-23-2013, 12:16 AM   #19
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Quote:
Originally Posted by dapz325
Quote:
Originally Posted by longliven54 View Post
I have had electric cutouts for about a year now. exhaust note has progressively gone louder as the cutouts do not seal all the exhaust gases. still a great DD, no drone just a bit louder than OEM overall.
Where are they placed?
they are placed soon after the down pipes, just as mid pipes start
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      10-23-2013, 01:52 PM   #20
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love this idea flip a switch and u got track mode
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