Exhaust Cut-out [Merged 8-9] cut out bypass

[Lionel Hutz]

You get under the car and remove the plate.

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[TSIMonsteR]

I haven't ever seen anything like that but it looks like it would be pretty sweet. I don't know if you would actually gain anything out of it but it sure would make a lot of noise

It would be like running an open downpipe

 

[IslanderTsi]

It would be like running an open downpipe

Great for the track or the occasional saturday night or something.

 

[boostedinaz]

I would like to do something like this down the road and run a stock or very quiet catback on my car. Not so much for the sleeper effect, but more for noise and comfort.

 

[Gunter]

wouldn't this cause backpressure and bad air flow while the dump was closed? (bigger problem on the manual one since its a pain to open it when you want to let loose on your car at random). I just see the air wanting to flow into the dump area and having nowhere to go so it forces its way back up the downpipe or causes at least a lot of turbulence in your exhaust?

 

[boostedinaz]

wouldn't this cause backpressure and bad air flow while the dump was closed? (bigger problem on the manual one since its a pain to open it when you want to let loose on your car at random). I just see the air wanting to flow into the dump area and having nowhere to go so it forces its way back up the downpipe or causes at least a lot of turbulence in your exhaust?

Not really. Air is a fluid so just like water some will "fill" the area that is in the dump and the rest will go past it. It may cause some turbulance but nothing that would cause any problems.

 

[Gunter]

ah ok, that makes sense then

 

[90 TSI FWD]

here's the manual exhaust cutout on my brother's 1g awd

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sorry for the huge picture.. i dont know how to resize.. well, it was like 40 or 50 dollars on ebay. this took place of the cat. the only dowside is that the flapper warps and starts to rattle really loud, so he took the spring from his brake pedal and attached it to the lever on the cutout to hold it shut. also, no welding or anything was done.. just adapters and muffler clamps. he located the lever to pull the cutout open right next to the right side of the steering wheel under the gauges and made a separate setting on the safc2 for open/19psi and close/stock psi..

 

[jredgo1234]

That's pretty cool, so he can switch from sleeper to race settings and back again with out getting out of the car. NICE

 

[GstRacer]

well just bought a 3.5 inch QTP electric cutout so i can open and close it from in the car, well my buddy has one on his civic with and H22 swap and it gave him some nice power with us it should give a shit load and way faster spool up and still be able to keep a desent quiet exhaust on the car. like right now i have a greddy evo and it's nice but very restrictive vs say a busher or a VRS sooo... the cut out weith help that out, wanted to see if others had it and there ideas and pics.

 

[87supra_90gsx]

I also wanted to know if anybody was using this.

 

[desolateboosted]

This is probably not going to help much contributing to your question but I am also going with a cutout soon. I'll probably end up getting the 4" version with it mated back into the stock exhaust. I'd also want to know if someone has done this yet.

 

[Wicked96GS-T]

I have a 3" QTP on my GST, and I must say that it makes a vast difference in power over the stock exhaust. It should make some power over a greddy evo also though. I don't have any pics of mine, but i remember clearance under the car for the cutout was a bi***.

 

[TimG]

I have my cutout welded onto my downpipe and a McCord's unit on the way as we speak. I'm hoping to have it here by weeks end and bolted on for testing. I will have pictures and testimonial then.

 

[redline6k]

Heres a few pics of my setup. I made a setup similar to that for my buddys 2g and it worked great.

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[calreef18]

Hey all, I am looking for opinions. I currently have a 3" megan dp that's straight through, and I am running the stock catback. I'd like to change that to help the turbo breathe, and am debating on keeping the stock catback and putting a cutout right after the megan pipe, or a 3" all the way back to a new muffler. I really like the sound of a 3" with muffler, but the cutout would be super cheap. I have run with just the downpipe dumping and it sounds like ass, would the cutout pretty much sound the same since its coming out under the car?

 

[StR8sPo0Ln]

If your looking to be legal i would go full 3" turbo back exhaust. They are not that expensive since you already have the DP. Why would you want to not have the full system, dont do things cheap you will run into problems later. Plus a little restriction is required for good power.

 

[absolute_DSM]

If youre talking about the electric cutouts like QTP, I would think running a 3" to the rear would be possibly cheaper. Check out QTP.com for sound clips. Id be just like running an open downpipe.

 

[SpeedAddict62]

If your looking to be legal i would go full 3" turbo back exhaust. They are not that expensive since you already have the DP. Why would you want to not have the full system, dont do things cheap you will run into problems later. Plus a little restriction is required for good power.

a little restriction? um, no, not at all. Backpressure is the enemy, no matter what the case. Naturally aspirated engines have an exhaust system that compromises between a good scavenge and backpressure. In a turbo car, scavenge is not as important and we want the turbine to operate as efficiently as possible, so the less backpressure, the better, hence 3" systems being popular, and even 4" possible.

Having a 3" dp to a stock exhaust sounds like a big restriction. I would definitely go with the full exhaust if you have the money. Sounds great and it should give you some good power. I had a full turbo back, with mandrel bends, made for $500. Your system should be much cheaper, considering all you want is a cat back.

 

[AWDfrank]

I would go with the full 3"turboback. I am running open downpipe and can not stand the sound but, I also can not stand the smell in the cabin. The exhaust cut out will sound like open downpipe but if it's electric it will be a good solution to getting pulled over for having a full exhaust.

 

[VTRICCO]

i think the electric cut out is a good call

 

[calreef18]

Seems like the dump right after the downpipe sounds too much like a tractor as far as I remember, so I think I'll go with the 3" and get my greddy muffler off my old car onto it I'll get sound clips up in the gallery when I get a chance because I don't think anyone has an evo II on there yet.

 

[DSMunknown]

Just in case you're interested, click here.

 

[PieEyedPiper]

Those vids make it decievingly quiet, I'm sure.
But neat to see one in action.

 

[nightspeed87]

I know this thread is old but I must add to this as a personal review because I have an exhaust cutout on my awd 1g and its a great thing to have in my opinion. Why because, going full 3in back actually causes more backpressure than just dumping straight out of a 3inch exhaust with a cutout.
( Compare open dp to full exhast reguardless of the pipe size. )

Now I do agree full exhaust sounds better than open dp car, *( my gst with full 3inch catless, mufflerless exhaust sounds awsome . ) and my exhaust cutout 1g sounds a little like a hoss truck or something, but the main benefit of the cut out is to allow it to return to a stock like operation with the plate closed allowing you to be MORE street legal in this sense and if theres still a cat on the car may even allow you to pass emissions while allowing you to get all your engines power potiential with the cutout open.

I think the cutout is a good compromise for someone wanting the power but not always wanting the loud noise and inconvience of running a full exhaust system all the time.

By the way if your a sleeper this will be a great thing to do...