Put these on my truck 6 months ago and no leaks of fluid from GM leaking lines and my oil is so clean after 6 months from EGR delete and the extra power is so cool as a side benefit. Great job and quality craftsmanship, fit and results from these All Season Products! Just saying get them if you're on the fence deciding about it you won't regret them on your LBZ. They really make guys with regular LBZ stuff go wow that's cool, the sound and fit is great...... nuf said.......