Because I have to. I dont want the stock dinky driveshaft behind either my current sbb or my future 400+hp/500ftlb sbb. Plus its 33 years old, rusty, and I don't want to waste the money on it. I'm also gonna be racing it from timebto time and I dont want a 33 old part that is smaller than the exhaust to be the weak point. Plus the car has to be running during the week.If you are that dependant on your vehicle why are you changing something that isn't broken.
Is my terminology correct in the original post?