The way that I see it is WHAT CAN IT HURT. So i installed one 20,000 miles ago and I love it. I think it is a necessity if you are running any tuners that add fuel. I ran 15,000 miles on my oil with the smarty turned up on #9. at 15,000 miles the soot was high enough that I needed to change the oil and filter. If i did not have the bypass I would have been lucky to get 6,000 miles out of the oil on that setting. Good luck