This stuff is not just for older cars...I own a new Suburban 5.3L that I have modified to enhance it's performance. I added an Airaid cold intake system, a "cat-back" Magnaflow performance exhaust and performance tuned the engine with a "superchips" Max Micro-tuner. The fuel additive was the last detail to give me an incredible boost in performance. Even with all the hardware I noticed a difference in mileage and performance after two treatments...thanks for a great product!

Bill

West Chester, Pennsylvania