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LS1 Modifications

This is a discussion on LS1 Modifications within the External Engine forums, part of the LSx Technical Help Section category; I have a stock LS1 in my 98 Trans Am WS6. I am going to be installing exhaust and possibly ...

  1. #1

    LS1 Modifications

    I have a stock LS1 in my 98 Trans Am WS6. I am going to be installing exhaust and possibly an intake w/ throttle body. Just curious on recommendations for headers (need to pass emissions) and an intake(LS6 vs BBK vs Fast vs Typhoon etc.) Should the injectors be changed? Any help would be appreciated.
    Thanks
    Last edited by BeerMan; 05-04-2008 at 05:04 PM.

  2. #2
    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    I haven't quite decided what I want to spend yet, I want to get an idea on what everything will cost first. I will be moving from Wisconsin to Colorado this summer, so one of my goals is to make up for the lost horse power due to the altitude plus gain a few.

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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    Bang for the buck headers is Pacesetters.. easy to install, good price, etc.. and they have an emmission version.. (as long as where you are going aren't dicks about the headers as ALL longtube headers are technically illegal as they move the stock placement of the cats.. something to look into), as far as intake.. I haven't done the reasearch yet as I am sticking all my time/money into my 87 for now.. but the FAST 90 seems to be the popular one....

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    cutting and welding mark21742's Avatar
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    If I were you , I might switch to the LS6 intake, the fast 90 is too big for the small mods you are doing now and you can get an LS6 intake used for REALLY cheap. no you won't need injectors, but with an exhaust and intake you should get a tune.
    Good luck with the build man!!!

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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    Quote Originally Posted by mark21742 View Post
    If I were you , I might switch to the LS6 intake, the fast 90 is too big for the small mods you are doing now and you can get an LS6 intake used for REALLY cheap. no you won't need injectors, but with an exhaust and intake you should get a tune.
    Good luck with the build man!!!
    Hmm.. just a thought.. but he said he has to pass emmsiions.. meaning he has to keep his EGR system.. so switching to the LS6 intake would remove that..

  7. #7
    One of my friends told me that if I am going to be putting exhaust and an intake, I should switch out the cam. Does anyone think this is necessary?

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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    Quote Originally Posted by BeerMan View Post
    One of my friends told me that if I am going to be putting exhaust and an intake, I should switch out the cam. Does anyone think this is necessary?
    Necessary?? HELL NO! Thats a HUGE undertaking for someone in your position.. do little steps and work your way up.. when you start talking cams.. you have to match it up with your mods/goals..

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Silver Streak View Post
    Hmm.. just a thought.. but he said he has to pass emmsiions.. meaning he has to keep his EGR system.. so switching to the LS6 intake would remove that..
    True the ls6 intake has no egr, but with the ls6 intake and headers (cheaper without egr provisions), just take off all the egr tubes and put them in a box on the shelf. A tune would turn off the egr and it wouldn't pop codes so he would pass the odb2 emissions test, and as long as he has cats it should fly right through visual inspection.... if it looks factory it shoul pass without a problem.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Silver Streak View Post
    Necessary?? HELL NO! Thats a HUGE undertaking for someone in your position.. do little steps and work your way up.. when you start talking cams.. you have to match it up with your mods/goals..
    100% agree. most people start out with the bolton goodies ( exhaust, intake, cold air intake, and more) you can do all the bolt ons and never get a cam. I would highly recomed getting a tune after you do the bolt ons though, the tune will help get the most out of your setup. If you get a cam you need to have the supporting parts i.e. ( exhaust, headers, intake, stall if you have an automatic) you get the most out of matching your cam when you match everything to your Exact needs.
    and remember, bigger isn't always better.

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    Senior Member Tyler_LS1's Avatar
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    you can get the LS6 intake with the egr provisions from SLP. I believe SLP is the only company that has it, its an LS6 intake modified to work with the egr
    When i get the money thats what i will be getting
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    15 sec. Oh yeah, its fast UTVols98's Avatar
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    Shorty headers will allow you to keep the cat's in the same place.

  13. #13
    If I bought a GM version LS6 intake I would have to eliminate the car's EGR stuff? If so, then if I bought headers I would have to buy ones that are not set up for EGR?

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    Quote Originally Posted by UTVols98 View Post
    Shorty headers will allow you to keep the cat's in the same place.
    dont give you the gains to justify the price...

    get mid/long tubes.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by BeerMan View Post
    If I bought a GM version LS6 intake I would have to eliminate the car's EGR stuff? If so, then if I bought headers I would have to buy ones that are not set up for EGR?
    Exactly. that is the way I would go!

  16. #16
    15 sec. Oh yeah, its fast UTVols98's Avatar
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    Quote Originally Posted by andrew rs View Post
    dont give you the gains to justify the price...

    get mid/long tubes.
    If you get the mids or long tubes you'll have to move the cats and that's when you'll fail the emissions test. Just get the shorty's with a high flow cat if you want to see the best gains.

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    Member Jon7I2's Avatar
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    As far as the intake is concerned wait for Weiands new LSX intake to come out, whenever that will be and buy that. It should prove to be a solid bolt on.

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