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No matter what motor you get you'll never have the power of a supercharger. And swapping a new motor will be around the same price of a supercharger. You have low miles man, just get a supercharger and be happy with another 100hp. When your tired of that ump it up with a pulley and better intercooler and hit the 400hp mark.
sorry to jump it on your conversation but I have the same interest as previous poster of upping hp. although engine swap is out of the question as I only have 43k miles on my 01 GT. so super charger bumps stock 260ish hp to around 360hp? then pully and intercooler another 40? am I to understand its the pully winding SC faster for the ponys and better inter cooler to compensate for higher temps? sorry I am not to familiar with SC's. I was considering Nitrous but still gathering info. will one or the other damage engine sooner? thanks again