I know this is an old thread but I have noticed this myself. My ecu also didint read 100% full throttle. I fixed the issue by shimming where the throttle cable goes through the throttle body. I made the shim out of a piece of flashing. Maybe less than a 1/16" did the trick. Probably not the right thing to do in some people mind but it has worked for years and is secure in there.
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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