Smaller Pulley

My friend blew the motor in his GTP right before installing a 3.4" pulley which he gave to me. I’m going to get a Gatorback belt and tune the car. Will I notice a suffcient improvement & my engine has 140,000 miles on it will it put more strain on the engine?
Also I just painted my rims I couldn’t stand those ugly gold rims!!!!
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http://i35.tinypic.com/i4qqvd.jpg

If you have some appropriate modifications before installing the pulley you should see a good increase in power. If you haven't made any other mods the pulley will put a strain on your engine and you could actually lose some performance.

The mods you need before doing the pulley are: Cold air intake, open exhaust preferably headers, colder plugs, high flow cat with an open exhaust. A reprogrammed PCM will help with performance but it it not necessary for the pulley but the above mentioned items are almost required.

Dont forget the 180 degree t-stat.

Looks like I'm going to hold off on installing the pulley till I get the proper mods done...Thanks for the Help!!!!!

good idea. No sence blowing two perfectly fin 3800's