Has anyone installed the GF Performance Chip kit? It claims to add 60 horsepower add 4-7mpg and lower co emissions by 25-40%. I'm afraid of it and that it might mess up the other emissions and fuel and well, just mess up my engine. I have a 1988. Can anyone advise me?

Unless it comes with a nitrous bottle, I'd be skeptical of the 60 HP gain.  MPG claim maybe.  If it sounds too good to be true, it usually is. 

|UPDATED|6/6/2012 10:53:26 AM (AZT)|/UPDATED|

I read about it  and  wondered the very same  , But I have yet  to run across anyone that has  installed  one of these Chips on a C4, I've so far picked up mpg's  just by adding  a  K&N factory replacement  air filter , one of those power couplers, And  Cutting out  the  middle  of the Air Filter  Cover ......... I'd say I picked up about  4-6 mpg HWY. I'm going to cut out those screens off of the  MAF next  and then add a Hypertech Chip last .

Run Forest...RUUUUUUNNNNN!!!!

My '85 gets 25mpg on the road....it has a Hypertech chip in it. I gotta agree with the others here....that much of a HP increase claim is gunna be bogus...unless they specify you must do other stuff, also, like a cold air intake, headers/mufflers, etc.

I hear You Donald  , I Guess  what  I was really trying to say is  ....... Reading this  article C4 Corvette Performance Enhancement - www.c4vettes.com I myself have a lil better understanding on how to get  what You  & I are looking for . I've talked  to a few C4 guys here in Nor-Cal and  They pretty much say do you  Mods  1st and then add the  Chip so it then can Adapt  ( Calibrate ) to what you've added . They all told me the  Hypertech chip was the one to go with  ,If you have a LT4 or  LT1 JET performance also offers something  for them , Jet does make a Chip for the  L-98 But it's only  for the 1987 Model  & Neither of them knew why  . I've also talked to a couple of guys  whom had their ECU's re-mapped  but this was in the early  going of the C4  & now  I can find anyone who has the  software, I went to our  local Chevy  Dealer  ( Biggest  Corvette Dealer ) here in Silicon Valley and  these guys couldn't even tell me  were to find the Emergency Flasher Relay .... They have nothing that goes back that  far  & These are the guys  that have been there for over 20 + yrs , I did find out it's somewhere in the dash that's the answer I got  . I then knew that they really don't think much of the C4, I want  More Horse power & Torque but don't want to tear the engine apart  to do it  ,I'm considering  one of those rear mounted Turbo Kits  I hear  400 Horses @ the rear are not  far fetched .  

 Hey Guys. If you'd read closely the ad on the CF Chip, you'll see it says ''gains 'up to' 60 more HP''.  So, if it increases even 1 HP it's done it's job. I'd think you may get 3 to 5 HP out of it because most of the chip is probably for the gas mileage part due to a little more timing. 

All these ones are the same, I agree with what was said earlier, this would be a maximum along with a lot of other mods.

IF I remember cerektly, on my Hypertech, it really only makes a difference at WOT(wide open throttle). I do know I get really good mileage, and it runs really well at all speeds....