back in the saddle
Join Date: Oct 2006
Location: Tipton, Iowa
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Ok, here's the deal as simply as I can explain it... The X race and X street are so close you won't feel any difference. On a dyno the X race might get you 10 HP more but that's nothing you'll feel. The X street is obviously going to be more streetable than the race due to the fact that the race locks the converter in 2nd through O.D. The race takes a bit of getting used to on the street, or specifically the highway, but it's doable and a lot of people like it (including myself). On either Extreme file you're looking at 400-425'ish RWHP depending on your truck, the dyno, and whether it's a full moon or not. The main difference is the transmission shift strategy.
X race: about 160 HP on my truck
X street: about 150 HP on my truck
street: about 100-120 HP guestimate.
'06 True Blue/Silver 250 crew cab
ARP's, EGR blocked
AFE stg.2, MBRP 4" pipe
Air Dog 150, ITP reg. return
Bulletproof oil bypass system
Ride rite air springs in the rear
EGT, boost, and fuel pressure gauges by DiProcol on the pillar
Plus a few other odds and ends...