Well I cant seem to find anything on here about injectors but here is my question. When I have the 87 performance tune in my truck it seems to fall flat on its face after 5000RPM. I was thinking maybe it is a fuel issue, would upgrading the injectors help? I have the following mods XCAL2, AF1, Troyer Ignition Upgrade, Gibson shorty's, magnaflow cats, Borla cat back, 75MM BBK throttle body, honed out upper plenum, and underdrives. Motor is a 98 4.6 with 38,000 Miles. Thanks

 

Bump.

I'm wondering the same, I'm running about the same setup as you. At what point do the injectors need to be upgraded?