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***I have applied a similar answer to another question on WikiAnswers*** Pontiac Grand Prix GTPs are equipped with the Eaton M90 roots-style supercharger. As far as bolt patterns go, I believe it will fit. However, in order to operate properly, I believe a lot of electrical retrofitting would be necessary. The largest concern, however, is that the 4T65E transmission in the GT would not be able to safely handle the power and torque that GTP produces. The GTP is equipped with the 4T65E-HD "heavy duty" transmission, which is capable of handling more power, i.e. supercharger. Applying the supercharger to the GT is probably more trouble than it is worth, and I would not recommend the application unless all the parts are in front of you and readily accessible, and you are willing to deal with any possible headaches that come along with this process. As far as aftermarket superchargers go, they are out there for the Pontiac Grand Prix, but again make sure of what transmission/motor you are applying it to. On another note, installing a smaller supercharger drive pulley will increase the horsepower with minimal work or involvement. I hope this information has helped to answer your question!

****** Edited to make more accurate ******

What you want to do here is actually do what is commonly called a "top swap" and has been done MANY times over in the 3800 community. If done correctly, the setup will be faster and as reliable as a stock GTP engine with the supercharger. This would include the addition of a supercharger, plus you have to change cylinder heads, swap out fuel injectors, and program the PCM (powertrain control module) to handle the new "GTP" setup.

As far as your transmission, he is correct, you will eventually need to upgrade some hardened parts in the tranny.

Of course, another possibility is to swap your L36 (naturally aspired 3800) with an L67 (supercharged 3800). This would probably work out to be a bit more money, but would save you some headaches.

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Q: What kind of supercharger is in a grandprix gtp and will it fit in a regular model and is there a better supercharger kit you can use?
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