GXP intake mani(you ever seen this?)

[MrPoopyButthole]

Can't you guys do the LS6 manifold?

[DirtDog]

Yes im pretty sure its also works....either way either of them are better than ls4 stock one

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[jteske88]

yeah i plan on doing the ls6 intake swap, god bless 243 heads with catherdral ports lol

[blueguy]

LS6 works, just needs some modding.

Has anyone used a FAST IM?

[GTPpower]

Looks to me as if you would lose power if you swapped to this. I'm betting that whoever had this made was planning on feeding it with a turbo.

[PurpleGuy]

LS6 works, just needs some modding.

Has anyone used a FAST IM?

Yes it's been done but took a little bit of modding and looked kind of tacky IMO. Not really a way around it though

[DirtDog]

Well the ls4 intake is restrictive to an extent. From what I gather after it goes thru the TB it gets smaller. I can't remember how.much smaller but I've seen an ls6 and ls4 side by side and how much smaller it gets is stupid

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[GTPpower]

It's more of the design, not which has a bigger TB opening.

[jteske88]

Hacking up a fast intake has been an idea but, I don't wanna ruin it lol

[91parkave]

Hacking up a fast intake has been an idea but, I don't wanna ruin it lol

you wont heres the link for the fast install FAST102 LSXr and Nick Williams 102mm Throttle Body Install - LS1TECH

It's more of the design, not which has a bigger TB opening.

The TB neck is the problem for us it almost cuts down 30% to snake around the opsu. this is the biggest restriction, and why its pointless to port the manifold leaving this piece intact.

Yes it's been done but took a little bit of modding and looked kind of tacky IMO. Not really a way around it though

why tacky? all the other LS manifolds besides the truck are cleaner on top unless you saw somebody with LS4 rails rigged to work with the Ls1/6 Intake.

[DirtDog]

^^^^ that was what I thought about the TB but I didn't wanna argue cause I didn't have hard facts just pics and threads I've read

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[PurpleGuy]

Truthfully for the price of a FAST intake it's not really worth it. A FAST is what? like a grand for a new one. You can get an LS6 for less than half that. I'd get an LS6 and put the rest of the money toward headers, or a cam...or both.

[91parkave]

depends on the mods i mean these manifolds pull power everywhere on modified engines. If you have heads and cam plus supporting mods a ls6 intake wont come in the same range as a fast will

[GTPpower]

The TB neck is the problem for us it almost cuts down 30% to snake around the opsu. this is the biggest restriction, and why its pointless to port the manifold leaving this piece intact.

I'm talking about switching to the manifold included in the link...