The stock bottom end will hold up just fine with both pullies. The proper fuel and a good tune will make your stock componenets live. Don't detonate and bounce the rev limiter and you will be fine. My stock Cobra is great with 8lbs of boost. It has been stomping people for 4 years now. Over 10,000 touble free supercharged miles. MY car had about 44 when I supercharged it. Doesn't burn oil...and it is reliable. I have taken it on 30-100 mile trips many of times.