Reviewed By Mitchell M (Clanton, AL) Reviewed for a 1997 Pontiac Firebird —3/3/2017 11:37 AM
Bear with me I've only had it installed for a week. I purchased this product with a mindset that it would help in HP and MPG. After further research after the fact, I learned this product is primarily for HP. I noticed a big difference in HP and sound. I am happy with that. I was not expecting such a cut in MPG. Currently I am losing over 3 MPG. Over 50 miles per tank. If power, and only power, is your goal, great product. Maybe an engine tune will help the problem.