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Where is the best place to put a cutout?

This is a discussion on Where is the best place to put a cutout? within the External Engine forums, part of the LSx Technical Help Section category; I am going to be installing my exhaust on my car and I am getting a cutout but I need ...

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    Where is the best place to put a cutout?

    I am going to be installing my exhaust on my car and I am getting a cutout but I need help on where to put it, and I am curious which would be better to do. I am doing 2.5" piping off of the headers and meeting it into a single 3" pipe all the way back to the muffler and out as 2.5" duals. Would it be better to put the exhaust cutout up front where it meets into the 3" piping, or should I put it right before the rear exle. For clearance issues, the rear axle area would work better, but will I lose much sound? I am also curious if either one would be better with air flow and performance? Let me know if you have any ideas. Thanks.

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    Senior Member GULLETT17's Avatar
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    towards the rear will reduce cabin noise and exhaust fumes/smell . . . i dont think there'll be much difference in performance, maybe slighty better flow up front do to less pipe to flow through , nothin you would notice i dont think. as for sound outside, i would say it would be close to the same.

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    Rice Hungry GottaHaveLS1's Avatar
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    If i could afford it, I would get 2 electric cut outs just after the headers. I'm sure it will resonate and smell sometimes, but i would keep it closed most of the time until I really want to be an asshole in my neighborhood. I would assume that the closer to the headers, more power will be gained. With 2 cutouts, no one can make fun of our Y pipe anymore.

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    Senior Member GULLETT17's Avatar
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    Quote Originally Posted by GottaHaveLS1 View Post
    If i could afford it, I would get 2 electric cut outs just after the headers. I'm sure it will resonate and smell sometimes, but i would keep it closed most of the time until I really want to be an asshole in my neighborhood. I would assume that the closer to the headers, more power will be gained. With 2 cutouts, no one can make fun of our Y pipe anymore.

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    i would but it as close to the headers that you can, and if your not gunna use it much who cares about the smell, just haul ass and you will not have to worry about the smell coming in the cabin

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    Just buy one of these....

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    Quote Originally Posted by suede View Post
    Click for full size
    Just buy one of these....
    Where?

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    MANWHORE TEAM suede's Avatar
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    Here, Maybe Ebay... where ever, Its in my future anyways just savin up, kinda spendy, but i think it willbe worth it

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    15 sec. Oh yeah, its fast UTVols98's Avatar
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    Right after the collector tube on the header.

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    Quote Originally Posted by UTVols98 View Post
    Right after the collector tube on the header.
    This is for sound.

    You will be down on power that way.

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    15 sec. Oh yeah, its fast UTVols98's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    This is for sound.

    You will be down on power that way.
    Your only talking about 1-2 hp.

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    Quote Originally Posted by UTVols98 View Post
    Your only talking about 1-2 hp.
    Maybe at the peak, but even more loss under the curve.

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    Moderator Firebirdjones's Avatar
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    I've never found this to be a "down on power" problem. The cars that I currently have a pair of cutouts on generally pickup up about 2 tenths and 2-3 mph when I pull off the caps.

    The picture in Suades post is exactly what I was talking about when it comes to a 4th gen single system,,,putting a pair of them in the Y-pipe is the way I would do it. Effectively acting like a dual system when opened and bypassing the factory single system setup.

    They tend to be more visible this way and could cause ground clearance issues if your car is lowered. But it's the most effective way.

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    Quote Originally Posted by Firebirdjones View Post
    I've never found this to be a "down on power" problem.
    This is true.......I'm only running a single cutout, but when I got my SS dyno tuned two weeks ago, we ran one run closed and one open. With the cutout open I gained (only) 4 rwhp BUT 15 ft/lb of torque at the rear wheels.

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    Quote Originally Posted by fxgs View Post
    This is true.......I'm only running a single cutout, but when I got my SS dyno tuned two weeks ago, we ran one run closed and one open. With the cutout open I gained (only) 4 rwhp BUT 15 ft/lb of torque at the rear wheels.
    A single is much different than one at each collector.

    Some may see gains, some may not. I know when capped, I have much better power under 4200 RPM's.
    When open...it takes it until 4200 RPM's to pick up more power.
    And that is a built motor. Not a stock cammed LS1.

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    Where do you have yours at? Where the exhaust meets together?

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    Member MnLS1's Avatar
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    should I cheap out and just buy one cut-out and install after the V in the Y or just wait and buy two, and istall each in the V?

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by MnLS1 View Post
    should I cheap out and just buy one cut-out and install after the V in the Y or just wait and buy two, and istall each in the V?
    It's up to you. Obviously if you go with the electric doors to add to your cutouts things can get more expensive in a hurry if you install a pair of them.

    It's all a matter of what you really want. I think you'll find that most owners of 4th gens will have just one cutout somewhere in the I-pipe,,,,probably due to clearance issues and/or cost factors in as well. Hiding them may also be an issue since some states don't allow these to be installed.

    Although I have seen quite a few though at the track with a dual cutout setup in the Y-pipe,,,,,great way to avoid the single system before it funnels down.

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    Quote Originally Posted by TRIROCZ View Post
    Where do you have yours at? Where the exhaust meets together?
    Me?

    Each collector I have a manual one. Isn't the ideal set-up either, even on my car.
    I would really prefer the y-pipe one...but I run duals when capped, so....
    I don't recommend this for stock cubed LSx's. Or without a fairly steep gear.
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