if your engine is stock it cant rev as fast, but i would say the off road x pipe with no cats is killing your low end power, the cats will definitely help your performance on a stock or slightly modded engine
i installed the g-force synchr t5 in my car, the first four gears are about the same as stock ratios however 5th gear is a .59 great for the highway. with 373's and 275/50/15 at 75mph i am under 2500rpm, cant get much better than that
check out their website it will give you all the info you need. you can send them your tranny and they will install the gears, or you can order a complete tranny from them, or you can get the gear set and install it yourself. the synchro t5 what i have from them is good for 600hp. the tranny is great, blows tremec away, ive had bad experiences with tremec, gave these guys a shot and i am not dissapointed. your gonna pay a bit more than a tremec but its worth it.
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