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PerformanceTrucks.net Forums (https://www.performancetrucks.net/forums/)
-   GM Engine & Exhaust Performance (https://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/)
-   -   Largest header primaries that will fit? (https://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/largest-header-primaries-will-fit-539938/)

DrX Sep 27, 2015 05:03 PM
Largest header primaries that will fit?
 
Anyone ever built/found a header with larger than 2" primaries that fit into a 99-06 truck. Is it even possible with stock motor mounts? Would prefer 2 1/4".

thewrx Sep 27, 2015 05:19 PM
6 bolt heads?

Think your looking at custom, but something that would require that kind of flow i would guess most shit is custom.

03sierraslt Sep 27, 2015 05:25 PM
What exactly is your exhaust set up from front to rear ?

DrX Sep 27, 2015 05:29 PM
Originally Posted by thewrx (Post 5314333)
6 bolt heads?

Think your looking at custom, but something that would require that kind of flow i would guess most shit is custom.

Yes 6 bolt heads and expect custom is the only option over 2". Just wondering if it is doable.

DrX Sep 27, 2015 05:36 PM
Originally Posted by 03sierraslt (Post 5314334)
What exactly is your exhaust set up from front to rear ?
Currently ARH 1 7/8" to 3" full dual through FM Super 50s on the street. Midpipes are removable for the strip which leaves the merge collectors as the tightest bottleneck.

03sierraslt Sep 27, 2015 05:47 PM
Ever tested back pressure?

DrX Sep 27, 2015 06:14 PM
Originally Posted by 03sierraslt (Post 5314340)
Ever tested back pressure?
No, I'm mainly concerned with all out open header conditions.

Blown06 Sep 27, 2015 11:41 PM
Over 2" is going to require a custom built header.

I'm considering doing this myself right now as well.

DrX Sep 28, 2015 08:34 AM
Originally Posted by Blown06 (Post 5314406)
Over 2" is going to require a custom built header.

I'm considering doing this myself right now as well.
With motor plates, you have a lot more space to work with.

sprayedenali Sep 28, 2015 01:58 PM
has anyone ever tried a SBF header with LS flanges welded on..?

just a thought


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