[megaman06]

For performance and better MPG, I've had great success with my Smarty Jr. I don't race or anything, but it really woke up the truck, made it more fun to drive, 3+ extra MPG. If you want lots of performace, and want to invest in guages, etc., the Smarty Sr may be best. Depends what you want and how much $ you want to spend. HP is epensive! Just my .02 worth. Good luck

 

[megaman06]

Got 3 settings on the Jr. 40, 70, and 100 hp increase. Then it has some other fine tuning you can do. The Smarty Sr. goes up way over 200 hp increase. Pretty hard on the tranny I hear at those higher hp settings. Mine has more power than I will ever need. Its quick like a gas burner, tons of torque, not much smoke. And they say it won't hurt the truck if you don't rawhide it and abuse it. Look up Bob Wagner on here, he is the Smarty guru, owns the company I think. Great guy, I bought mine directly from him and had it in 2 days, free shipping. Had a little trouble getting it downloaded, so I called him. Got him right on the phone, walked me through it, and no trouble since. It was my error. Have a good day, good luck.
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