Here look at this. Scroll 3/4 down and look at the major difference between the LS4 intake as opposed to the LS2. The LS4 is much more blocked off so I can see the throttle body spacer adding velocity before it enters the intake chambers. Here is the link: Airraid Throttle Body Spacer: The Verdict
-Mike
__________________ 05 Black GP GXP - 160 , No Res., FWI, TransGo Sh. Kit, Finned Al. Trans. Pan, Intense Poly MM's, Perf. Trans. 3.29's w/2800 Stall, CL Hogan DP, Jet TBS, VMS Tuned, LS2 Tr. Coils, XP-5243 IR Plugs, Ft. & Rear Stb's, DP & X-Over DEI Wrapd, Smooth Int. Elbow, SLP 1.85 RR's, Intense Oil Res. PR's, Royal Purple Oil, Stealth Trans. fl., HSRK, Dual MH Trans. Coolers 
1997 Blue/Green Grand Pirx GTP - 1.9 Rockers, SS Headers, Tucker PCM, 3" DP and HI-Flo Cat., Wiz-Air CAI, EGR Delete, 180* |