Can anyone give me ballpark power figures for a 4.7 with cold-air intake(Volant, intense, etc), Fastman throttlebody, JetChip module(stage II), JBA headers with high-flow cat and muffler(single pipe out).

I realize there are many variables here but just looking for ballpark - like +50hp, powerband moved up 300rpm, etc.

Thanks,
Ralph
2002 4x2 QC 4.7

 

Since you do have a 4x2, you will see better gains with the mods you listed. Intake, Headers, Exhaust, reprogrammed computer and Fastman, you should see 40-50 RWHP.

Good luck

 

Air Ram in another forum has his fully loaded except for the Jet chips (but he has HO manifold, no Fastman, under pulley, HO cam). His, based on his trap speed at the end of the 1/4 mile last Friday night in Sanger, TX, is about 290 HP at the flyweel (i.e., about 245 at the rearwheels). http://www.speedworldmotorplex.com/calc.htm