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I do have the A4, I'm looking at all options for tuning. The mail order cpu tune might be better, I was looking to see if the handheld was worth the money, and what benifit I would see....
No tune or tuner is worth the money unless you have done mods like heads and cam or FI.
Or maybe changed the axle ratio.
If you really are bent on a tune get a decent dyno tune from a reputable tuner, it's only a few $$ more then a caned tune or hand held tuner. JMHO
From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
I used it for my F150 a few years back. Hell you just reminded me that I still have it. I'll have to throw it on the auction site. For the F150 it did exactly what i expected it to. I don't know for the Corvette though.