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#1 |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
![]() After having my electric exhaust cutout for almost a year and a half, I figured I would start a thread that can help others in their decision to go with an exhaust cutout. Many other members on this site have cutouts and they should also share their experiences in this thread.
A LIST OF COMPANIES THAT MAKE ELECTRIC EXHAUST CUTOUTS: EDIT (6/1/08): DON'T BUY A BADLANZ CUTOUT! He has never been able to create a cutout that is on par with the other alternatives out there. If I were to do over again, I would spend a bit more for a QTP, DMH, or ATP. While all cutouts leak, the Badlanz cutouts seeming leak worse/quicker than others. QTP: http://www.quicktimeperformance.com/QTEC/index.php BadlanzHPE: http://badlanzhpe.com/ StreetPro: http://www.streetpro.us/ McCord: http://www.mccordcg.com/mpp/order.htm ATP: http://www.atpturbo.com/root/releases/release091004.htm DMH: http://www.dmhperformance.com/ (I know there are more but these are all I can think of for now) There are many threads about the subject on nasioc. Some of which are listed below: I think this thread has the most information: http://forums.nasioc.com/forums/show...ghlight=cutout Here are some others: http://forums.nasioc.com/forums/show...ghlight=cutout http://forums.nasioc.com/forums/show...ghlight=cutout http://forums.nasioc.com/forums/show....php?t=1136340 http://forums.nasioc.com/forums/show...ghlight=cutout http://forums.nasioc.com/forums/show...ghlight=cutout http://forums.nasioc.com/forums/show...ghlight=cutout SOME BASIC THINGS TO KNOW: 1. Cutouts are welded into the downpipe 2. Cutouts are insanely loud! Take the loudest Subaru exhaust you have heard and multiply it by 3. Cutouts make Harleys sound tame. It will make your ears ring. 3. Cutouts will spit flames out under the car 4. Cutouts are almost unbearable to use in stop and go traffic because of the fumes. 5. Cutouts will leave a lot of soot under and on the sides of your car. 6. Electric cutouts will all eventually leak from being over torqued over time. The leak sounds like a baseball card in bicycle spokes. If you already have a medium-loud catback, you won't hear it. I have a STi axle back, thus I can hear my leak. 7. Electric cutouts MUST be sealed around the motor with silicon or something similar. My cutout failed to corrosion after only 6 months due to rust. Since sealing the motor assembly, I haven't had a problem. 8. There is usually ground clearance issues associated with cutouts so make sure you have properly test fit where your cutout will sit once installed. MY SETUP: ERZ DP w/ BadLanzHPE cutout welded in: -$150 for BadlanzHPE cutout -$100 for welding and installation (included wiring) ![]() A pic to show how much fuel collects in the cutout (hence flames, I was running rich): ![]() Also, in the top left corner of that pic, you can see how the motor rusted out because I didn't seal the rubber boot that protects the motor with silicon. You must make sure this part of your cutout gets sealed with silicon or something similar! PERFORMANCE: UNTUNED: My performance observations were (stock turbo): -Boost came on about 200 rpm sooner -Power felt much more linear with it open (smoother power delivery) -Gained about .5-1psi of boost (depending on gear) -The car felt much stronger at the top of the rev range (boost seemed to hold on longer) -Never saw a single CEL Untuned, the car was easily faster than stock STis and stage 2 WRXs. I felt that much of my power was coming from my cutout. While I was happy with my car, I wanted more power thus I finally went in for an EcuTEK tune from Harvey at Super Rupair in Boulder, CO. TUNED: (much of this is what the tuner said) -"Wow this car spools quickly with that thing open" -"This car reacts really well to changes in boost" -"Power holds really well until redline" -"It seems as if the whole curve has moved to the left" TUNING NOTES: I went for 20k miles on my cutout untuned, stock turbo, stock ECU. I was running rich as hell, 10.0:1. Closed it would creep up to 10.5:1. When I came in for my tune (EcuTEK), my tuner was pretty surprised by this. For my baseline run, cutout open, I put down 200whp (6,000ft above sea level)which is what most stock turbo guys leave at fully tuned from the same dyno. After a couple of hours, I left at 227whp and 225wtq. My car did not respond positively from changes in timing since I think the ECU was so used to the cutout already. Instead, the car made big power from additional boost and leaning out the AFRs to 11.0:1. HOWEVER, ALL CARS RESPOND DIFFERENTLY! Just because I was running fine for 20k, doesn't mean that the next guy will. It was really odd that my car was running rich on the stock ECU but I think that may be a rarity. My dyno charts (sorry, I don't have an open vs. closed comparison): Stock STis put down 215whp on this dyno: ![]() A friends dyno chart (different dyno) that shows a comparison between open and closed on his '04 WRX: ![]() Keep in mind that this is uncorrected, 100+ degrees in the dyno room, and at about 5,500 ft in elevation. Its hard to see but peak change in power was 17whp and peak change in torque was 25wtq. These were back to back runs with no additional tuning. CONCLUSION: Cutouts are not for everyone. Most do not like the noise, I however do. I also really enjoy the added power. However, I mostly enjoy the ability to go from super loud, to super quiet at the flip of a switch. This is really nice for those who have girlfriends or wives who hate the noise that an aftermarket exhaust brings. I hope others will contribute their experiences as well so that all questions can be easily answered in the future. Thanks for reading, -D-Speed
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Last edited by D-Speed 2.5; 06-01-2008 at 11:58 PM. |
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#2 |
Scooby Guru
Member#: 92582
Join Date: Aug 2005
Chapter/Region:
MWSOC
Location: IA
Vehicle:* |
![]() Nice informative write up D-Speed 2.5, Thanks!
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#3 |
Scooby Guru
Member#: 25413
Join Date: Sep 2002
Chapter/Region:
Tri-State
Location: North NJ
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![]() I loved my cutout for the year or so I had it.
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#4 |
👏 Big Ron 👏
Moderator Member#: 18062
Join Date: Apr 2002
Chapter/Region:
MAIC
Location: I can save you a ton of cash
Vehicle:on car parts so PM me b4 j00 buy |
![]() Damn nice thread buddy. Please add this: http://forums.nasioc.com/forums/show....php?t=1136340
You get sticky! ![]() |
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#5 | |
Scooby Specialist
Member#: 43986
Join Date: Sep 2003
Chapter/Region:
NESIC
Location: Arlington, MA
Vehicle:2002 WRX wagon RIP 2003 330ci black/tan |
![]() It seems I post in every thread about cutouts, but I don't think I can bring myself to whore my dyno chart again. I have the QTP cutout, and picked up 10-20 hp and ft/lbs from 4-6.5k, though no peak hp. That was with my old 18G, and using the same map for open and closed. In a few days I'll have my car back with the new QTP electronic controller (along with 2.5l, cams, 20G etc.):
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#6 | |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
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#7 | |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
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#8 |
Scooby Specialist
Member#: 43986
Join Date: Sep 2003
Chapter/Region:
NESIC
Location: Arlington, MA
Vehicle:2002 WRX wagon RIP 2003 330ci black/tan |
![]() ![]() ^^^18G, TMIC, no cats, Borla Hush, ~21 psi I'll take some pics when I get my car back, but here's one with the old setup, which was a little more crude and dumped under the front passenger door. That location didn't comply with the rules at my local dragstrip, so it was moved back by taking some of the angle out of the pipe before the cutout. ![]() |
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#9 |
Scooby Guru
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![]() Great post.. My favorite is the Boost activated one From ATP turbo.
http://www.atpturbo.com/root/releases/release091004.htm It uses a wastegate actuator to open the gate. This way its instant and automatic.. Cruise around under 8 psi and the cut out is closed. Pass 8 psi and its open. Its adjustable so you could set it to 10,12, or what ever.. This one made 12whp on subiechicks car. CT |
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#10 | |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
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#11 |
Scooby Newbie
Member#: 44124
Join Date: Sep 2003
Chapter/Region:
NESIC
Location: North Shore, MA
Vehicle:2008 STI WRB |
![]() Yo, I'm the one with the 2004 wrx that D-Speed 2.5 mentioned in the opening post. It was D-Speed that convinced me to go with the cutout. For reference, I'm running a Super16G, ssautochrome tmic, hpebadlanz cutout on a txs full tbe, and utec.
The dyno chart D-Speed show'd was with my cutout open and closed, obviously, on my most aggressive map. I was running around 2 psi more with the cutout. As was already stated, I gained around 17 whp and 25 wtq. Also, my tuner tweaked my setup and maps so that I don't have to change maps when I open or close my cutout, so the two runs with the cutout open and closed was on the same map, the only difference is whether the cutout was opened or closed. As you can see, for me at least, the cutout really helped. The cutout is definitely super loud, but if you get an electronic one, then you can open and close it at will. I don't run my setup open nearly as much as D-Speed, but its great to have if you want that extra power or just want to literally ROAR. |
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#12 |
Scooby Specialist
Member#: 43986
Join Date: Sep 2003
Chapter/Region:
NESIC
Location: Arlington, MA
Vehicle:2002 WRX wagon RIP 2003 330ci black/tan |
![]() Yes, you did!
http://youtube.com/watch?v=yX3DAxpVd4k http://youtube.com/watch?v=rClayYgqzDA Other cars: http://youtube.com/watch?v=AwZzcjme4s0 http://youtube.com/watch?v=bsgOVy1_8R0 http://youtube.com/watch?v=jcfPVXsJH40 http://videos.streetfire.net/search/...5fa49845bd.htm I really need to get mine on video. |
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#13 |
*** Banned ***
Member#: 58477
Join Date: Mar 2004
Chapter/Region:
MAIC
Location: NoVA
Vehicle:. Member #1 of the witty MS Crew |
![]() i have a DMH cutout
http://www.dmhperformance.com/ |
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#14 |
Scooby Specialist
Member#: 85592
Join Date: Apr 2005
Chapter/Region:
BAIC
Location: Oakland
Vehicle:05 OBP |
![]() my cutout motor is broken so it's manual now meaning i have to get under the car and flip it by hand lol
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#15 |
Scooby Newbie
Member#: 127234
Join Date: Sep 2006
Chapter/Region:
MWSOC
Location: minnesnowta
Vehicle:ppg dog box.t daily driver |
![]() will you have to buy a complete unit, or just the motor?
what brand do you have? |
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#16 | |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
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#17 |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
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#18 |
Scooby Specialist
Member#: 123515
Join Date: Aug 2006
Location: antarctica
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![]() Hey D-speed, is it ok to open and close the cut-out while the car is driving? I heard somewhere that it is only good to open/close it when the car is at idle or completely off. What's your opinion about this? Any ill effects to the turbo/performance if it is opened while driving?
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#19 | |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
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#20 | |
Scooby Specialist
Member#: 43986
Join Date: Sep 2003
Chapter/Region:
NESIC
Location: Arlington, MA
Vehicle:2002 WRX wagon RIP 2003 330ci black/tan |
![]() The ECU adjusts timing when the cutout is open, so if you've had it open for a while, then close it and go WOT, you may get knock. It happened to me when pulling out of a gas station on a long trip.
I got my car back last week, with the new Q-Tec electronic controller mounted under the ashtray. I now only have to press the button once to fully open it, rather than holding down a switch for a 5-count (which can over-torque the valve). It can be programmed to open it partially, but I doubt I'll bother with that. It also can control two Q-Tecs, and I may find a use for it... ![]() Quote:
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#21 | |
Scooby Specialist
Member#: 123515
Join Date: Aug 2006
Location: antarctica
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Thanks! I'll be looking into a cut-out very soon...cops don't like my RFL around here in the suburbs....even if I am just cruising normally, damn melon-launching can catches their eye. ![]() ![]() |
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#22 |
Scooby Specialist
Member#: 114122
Join Date: May 2006
Chapter/Region:
South East
Location: St. Augustine, FL
Vehicle:1990 miata(RIP 05rs) red |
![]() What about manual cutouts, for those who can't afford e cut outs? Any suggestions? They seem less "cool" but may be more reliable?
Thanks, Kevin |
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#23 |
Scooby Specialist
Member#: 29516
Join Date: Nov 2002
Chapter/Region:
RMIC
Location: Denver
Vehicle:2005 WRX Wagon Former GC O.G. |
![]() You can do a manual cutout by simply getting the cutout Y-pipe from Summit and manually take the cap on and off.
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#24 |
Scooby Specialist
Member#: 114122
Join Date: May 2006
Chapter/Region:
South East
Location: St. Augustine, FL
Vehicle:1990 miata(RIP 05rs) red |
![]() What about the ones with the cable to open/close them? Have any info? Sites?
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#25 | |
Scooby Specialist
Member#: 43986
Join Date: Sep 2003
Chapter/Region:
NESIC
Location: Arlington, MA
Vehicle:2002 WRX wagon RIP 2003 330ci black/tan |
![]() Quote:
Here's a 3" universal fit exhaust cutout: http://www.jegs.com/webapp/wcs/store...9799_-1_458953 |
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