First off this is my first post but not first time using this forum. I wanted to start off by saying thanks to everyone that adds to these discussions and threads with your knowledge and resources. I've been helped a lot by you all over the last year and I'm very grateful for that. Now to the build.
2007 L33 in a Silverado Classic. Tuned, truck Norris cam, Texas Speed PRC 220 machined ported heads and 1 3/4in headers with 3in collectors yet to be installed (looking to do 2.5in duals since I got everything to do it for free) and just came into a FAST LSXRT intake with 37lb/hr injectors. Main question is this FAST. I have no instructions on install so information on that would be nice and should/could I use the 37lb injectors or stock? If I go 37 do I need bigger fuel pump also? It's returnless btw. Any information is welcome, thanks y'all

 

The FAST is an easy install. When you take stock intake you’ll see. I would get the low profile valley pan screws. The stock ones won’t allow for the intake to sit all the way down not allowing the intake and head ports to match.

Second if you go with the 37lb injectors you’ll need a fuel pump and you’ll need a tune if it hasn’t been tuned for those injectors yet.

Now on the exhaust. Match the 3” collector diameter through the X pipe. After the X then come down to 2.5”. It’ll help alíviate exhaust restriction.

 

I do have a 3in Black Widow X-pipe so that may be a good direction to go. Now what about the intake manifold gasket? Does it go straight against the heads with just those O-ring type gaskets and torqued down or is their another more "traditional" type gasket I need to work in tandem with those? Thanks again

 

Good choice on the X. The only gaskets you’ll need are going to be the ones on your manifold.