Ac
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Senior User
Joined: Oct 2008
Posts: 130
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From: manchester tn
so what is the 6637 mod? i got a FPR kit order becous i lost the screen. the fpr shim is jest a bb right and what do you thant about the ingecters iam geting thim form jim at rosewood
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
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From: Southwest Georgia
Jim does good injector work and yes the FPR shim is just a bb installed, but you do not want you fuel pressure to be over 80 psi (70-75 is best). The 6637 mod is a open air intake system using a 6637 air filter and a short piece of 4 inch 45 degree exhaust tubing to attach it to your truck. Just do a search for 6637 mod or kwik filter.
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