Welcome. Stock SVT shifter is not compatible with your car. It is for a completely diferent transmission and wouldn't help you anyways. I would recommend doing the B&M shifter. As for the SVT header make sure you do it right. You need to buy the SVT Dip Stick, flex pipe, and a catalytic converter designed to work with the header and flex from the car. I found out the hard way what happens when you don't and now I have to buy those things anyway. Now i have to spend money on the same parts twice.
2003 Ford Focus ZX3(Brokus) - old and still busted
2007 Subaru Impreza 2.5i - current DD