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i need to know about cutouts

This is a discussion on i need to know about cutouts within the External Engine forums, part of the LSx Technical Help Section category; I want to buy some cutouts for my 01 ss ls1 but i - are there any bad things about ...

  1. #1
    Member chevyss1234's Avatar
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    i need to know about cutouts

    I want to buy some cutouts for my 01 ss ls1 but i
    - are there any bad things about having them?
    - if i want to leave my stock headers on can i easily come back later and replace them with some longtubes?
    - do you lose a lot of back pressure if you have these things on?
    - will i get a good bit more power
    - do i have to mess with the O2 sensors (like will the engine light come on)?

    thank you for your responses, any other tips or facts you would like to share will be very appreciated

  2. #2
    Member chevyss1234's Avatar
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    oh and where is the best place to mount them if i dont want to mess with sensors and stuff? the reason i posted this was because i couldnt find the answers to some of these questions in previous posts
    - thanks

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    Member chevyss1234's Avatar
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    oh and should i go one or two?

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    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by chevyss1234 View Post
    I want to buy some cutouts for my 01 ss ls1 but i
    - are there any bad things about having them?
    - if i want to leave my stock headers on can i easily come back later and replace them with some longtubes?
    - do you lose a lot of back pressure if you have these things on?
    - will i get a good bit more power
    - do i have to mess with the O2 sensors (like will the engine light come on)?

    thank you for your responses, any other tips or facts you would like to share will be very appreciated
    did you try the sticky's at the top of the external engine forum? just a thought. i will do my best here....

    the draw back to cut outs is the noise (which i view as a blessing), the exhaust gases being underneath you, and the loss of a bit of low end torque.

    it would be ok to run a cut out with stock manifolds, but would greatly obstruct gains as opposed to longtubes. you want to mount the cut outs as reasonably close to the engine, usually right after the header collector goes into the x or y pipe, application dependent. larger top end gains will come from opening the cut out and letting it dump early, but because of the elimination of back pressure you will lose alittle torque on the lower end. just have to roll with the punches.

    you should get your car dyno tuned and get the 02 sensors calibrated to the new exhaust so you wont throw codes.



    Quote Originally Posted by chevyss1234 View Post
    oh and where is the best place to mount them if i dont want to mess with sensors and stuff? the reason i posted this was because i couldnt find the answers to some of these questions in previous posts
    - thanks
    as i said, the closer up the better to the front end.....

    Quote Originally Posted by chevyss1234 View Post
    oh and should i go one or two?
    ive always, in my mind, drawn the conclusion that if i was going to do it, i would go two and mount them on an x pipe so they would have there own path and their own dumps. i havent seen any dynos between one or two cutouts, but like i said, it just made sense to me to go with two....
    i could be wrong.

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    Member chevyss1234's Avatar
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    thanks for the advice man

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    Member chevyss1234's Avatar
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    whats the best most reliable brand??

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    2002 Formula Firehawk 96z28's Avatar
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    get the cheapest one. They are all the same. unless you want electric but thats a whole different story

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    down with the lot lizards blackhawk01's Avatar
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    how cheap are the electric ones?? I want to get one for my Xtreme

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    Member Jon7I2's Avatar
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    elect 1's are about 189.99 $

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    no more 4th gen secondgearscratch's Avatar
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    a cut out is a cut out. you can always get the electric plate if you felt so inclined. the keith mccord powr plate is what i would recommend. he's an ls1 genius btw. tunes at a shop next door to my old work place occasionally.

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    Member chevyss1234's Avatar
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    no i definitly want an electric one its much more what i need..... electric...... cuz i gotta cut it off goin through security gates, near my house, etc.

  12. #12
    Member chevyss1234's Avatar
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    oh so if i did just one electric cut out, where would the best place be to put it for the most sound without messin with the o2 sensors, behind the cat?

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    Member Jon7I2's Avatar
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    There is a spot on our cars, just b4 the exhaust pipes goes over the rear end (passenger side), it almost seems to b designed for ideal cutout placement.

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    Member chevyss1234's Avatar
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    cool thanx man i'll check it out.... hey u know how big the stock piping is on the ss? its 2.5 isnt it?

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    Member Jon7I2's Avatar
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    umm i think its 2.75, im not sure but i know a 3 inch cutout will work, cuz i have a 3 inch cutout on mu stock catback and it welded up fine.

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    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by Jon7I2 View Post
    There is a spot on our cars, just b4 the exhaust pipes goes over the rear end (passenger side), it almost seems to b designed for ideal cutout placement.
    that seems too far away to be purposeful. if youre going that far back, just dump it out.....

    though i could be wrong.

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    Member Jon7I2's Avatar
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    Well I don't know if it nets anything over any aftermarket catback, but i have longtubes w/ a stock catback. So, it definitely helps for me. Its almost like getting a catback that u can turn on and off, but its just a electrical cutout. wen open it is loud, wen closed it is stock sounding. I like that way.

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    Member cobrahunter's Avatar
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    I gained 8 RWHP from my Flowtech electric single cutout placed under the passenger seat. Not a whole lot, but every little bit counts.


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    down with the lot lizards blackhawk01's Avatar
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    i like

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    Look into the DMH electric cutout. They have a 3 year warranty. The rest of them only have a years.

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