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Largest header primaries that will fit?

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Old Sep 27, 2015 | 05:03 PM
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Default 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".
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Old Sep 27, 2015 | 05:19 PM
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6 bolt heads?

Think your looking at custom, but something that would require that kind of flow i would guess most **** is custom.
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Old Sep 27, 2015 | 05:25 PM
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What exactly is your exhaust set up from front to rear ?
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Old Sep 27, 2015 | 05:29 PM
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Originally Posted by thewrx
6 bolt heads?

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

Yes 6 bolt heads and expect custom is the only option over 2". Just wondering if it is doable.
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Old Sep 27, 2015 | 05:36 PM
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Originally Posted by 03sierraslt
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.
Last edited by DrX; Sep 27, 2015 at 05:41 PM.
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Old Sep 27, 2015 | 05:47 PM
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Ever tested back pressure?
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Old Sep 27, 2015 | 06:14 PM
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Originally Posted by 03sierraslt
Ever tested back pressure?
No, I'm mainly concerned with all out open header conditions.
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Old Sep 27, 2015 | 11:41 PM
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Over 2" is going to require a custom built header.

I'm considering doing this myself right now as well.
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Old Sep 28, 2015 | 08:34 AM
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Originally Posted by Blown06
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.
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Old Sep 28, 2015 | 01:58 PM
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has anyone ever tried a SBF header with LS flanges welded on..?

just a thought
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