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LS4 1 7/8 Long Tube Headers?

 
Old 09-14-2018, 11:16 AM
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Default LS4 1 7/8 Long Tube Headers?

I read a post about a company doing a 100hp increase on a 08 pontiac grand prix gxp. One of the things they said they did was put on 1 7/8 inch long tube headers. They didn't say what kind though.
I'm wondering if anyone else has put those headers on before and if so which ones did you use? I/m having trouble finding some that will work. There is so little room in the engine bay. Let me know if anyone has any ideas. Thanks
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Old 09-16-2018, 10:45 AM
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If you want to improve flow... you can do so by reducing back pressure... Why not just install a exhaust cutout before the cat?

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Old 09-18-2018, 12:13 AM
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Originally Posted by motorminded View Post
I read a post about a company doing a 100hp increase on a 08 pontiac grand prix gxp. One of the things they said they did was put on 1 7/8 inch long tube headers. They didn't say what kind though.
I'm wondering if anyone else has put those headers on before and if so which ones did you use? I/m having trouble finding some that will work. There is so little room in the engine bay. Let me know if anyone has any ideas. Thanks
There are no off the shelf headers that size, if they were that size they would be custom built. Those are large primary tube , and if were used on this motor would probably cause a very noticible loss of all low end torque . Do a search here for headers, there is only a couple available. Adding 100 horsepower isn't easy, if that's your goal on the motor plan on spending a lot of money.
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