what are the differences between the hpp3, and the jet power control modual? performance, reliability, ect, again this will be for a 2002 xtreme 4.3l. Also jet puts out a throttlebody spacer, is this a worthwhile mod. thanks
don't bother with the spacer on csfi motors no gains really.
most everyone has hypertechs got to assume its the best one out there now. not sure how good superchips one will be but it should be out pretty soon.