I havent really seen a difference in power or gas mileage from the Helix Power Tower. I can say it looks cool under the hood. I would seriously suggest reading the instructions, throwing them away and going at it using common sense and mechanical ability. I was disapointed that I didn't even hear the whistle everyone had talked about, oh well I have probly spent money on worse things!
Chevy S10 TBI Spacer
I purchased the Jet Power-Flow TBI spacer for my 95 S10. The instructions could of been better. It could of been more specific saying where the bolt was on the transmission bellhousing. After installing the spacer there was better throttle response, more power in the mid and high end range. I didn't really notice a change in gas mileage. Ive only filled it up twice since I bought it. So I will have to to look at it more closely. The truck has a 4.3 Liter Vortec V6.