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  1. #1 Re: gt top speed 
    ohiomark73
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    Default 02-05-2009
    mine just shuts down at like 106!
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  2. #2 Re: gt top speed 
    chrisb
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    Default 02-05-2009
    256 is the limit in the pcm when modified. good luck hitting that! (108 stock)
    99 Grand Prix old build- CAI, Custom exhaust, HV3, Stage 2 TB, custom tune, ported heads intense s1x cam, headers.
    Nothing great Just a small T66 Turbo with a Hv3 On a stock tranny untill i finish the other one.
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  3. #3 Re: gt top speed 
    ohiomark73
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    Default 02-06-2009
    106 is what i said and that was said is in a round about way could be 104 or 105... its somewhere right there... it will do that with no problem it just then starts shutting off and on until you slow down. (SORRY)
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