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GTs come with the same tranny as Montes/Impalas, so I would think there would be no problem. I doubt GM changed anything between the two. Can't really give you any insight as the the 1/4 mile times, but I have the TEP shift kit on medium with a DHP for over 15k miles now and not a problem.
 

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1998 GTP coupe. Stock and rust free. Totaled @ 87K miles
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going to a 12" front brake setup will cost you about 1/10 in the quarter due to increase rotational mass.
 
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