I don't have experience with Jet either, but I have Hypertech in my 90. The good; mid range part throttle pick up great. The bad; had to put timing back to 10 (full throttle dropped off), idle got very rich, and got part throttle cruise lean surge. However that was with stock mass air meter (yours being an 88 you don't have to worry about that unless you converted) just put Granatelli (Pro M) meter and idle leaned out and surge just about gone. I'm planning to go to strip and test with and without chip. Now that I have have this I've heard very good things about Superchips. They ask what mods you have before they send it.
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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