So I added meth injection to my car recently. It was previously dynoed at 376 rwhp. So I really was hoping to see 400. Well the disappointment begins. He tweeked my tune and tried everything he could...393.2 haha. If only I could find another 6.8 lying on the floor I would have paperwork saying 400. Well besides all that I am super happy with my results. The meth gave me the extra cooling and hp needed. What a great upgrade for a great price!