The greddy kit should be plenty capable of giving you a bit more power. Invest your money into good engine management, and proper tuning. Once you get to around 300whp (not with the Greddy..), don't expect the car to last forever. Like Azcheron said, I've been running for 3 years this way, but sooner, or later the motor will let go. If you play your cards right, it will be later...