no i didnt. i had an L67 block, but running a certain amount of boost shouldnt matter. so long as you dont let it detonate then youre money. thats why you either run a conservative tune and have your car last forever, or you run a borderline crack addicted tune and your car is faster than **** until one day with cold weather where you get a knock spike and blow a bank of pistons away. its all in the tune.