Mo Go - but a little more fuel cost
Slam dunk to install. Had to remove 2 fuses but down loaded with no problems. Tuned to "regular" gas in an 8.1 GMC and had some ping but called in and the regular setting is set for 87 octane and I had 85 so bought some octane booster and solved that problem. Later fueled with 1/2 premium and 1/2 85 and so far no problems. Power gain is noticable, especially in mid range. A little dissapointed in the 87 octane setting as I was after performance gain as well as cost and ended up costing about a dime more per gallon for the 87. Haven't run enought to notice any fuel milage gain at this point and it is hard to keep your foot away from the firewall so we'll see if the additional performance is worth a dime/gallon. At this point I would recommend the programmer, however.
Up's And Downs.
Well, Installing the hyperpac was cake, and all of the features were easy to use, and the gauges and syno alone make it worth thr $500, but as far as being used to reprogram the enging for more power, that department is really lacking. all it has is one mode for regular and 1 mode for ultra gas, no options to install programing for changes to the motor, and no values to change. i couldnt tell a difference with the programing installed for the motor, except i got 11mpg instead of 14.