Are there any aftermarket header and free flow exhausts available for the 4dr 4wd Sportage? How close is the Kia motor to the Mazda motor it was designed from? Would Mazda performance parts work on the Kia motor? These questions are for a Gas, US spec. 2000 Sportage. I have 50K on it and just changed the shocks w/ KYB's and the ride is better. I also added a rear swaybar which helped keep it level on merge ramps. I would just like to be able to get more power. Also, what does the Power button really do?