Installed these today. Installation wasnt too bad, the hardest part was removing the bracket behind the throttle body after that its very simple. I only have 50k on my original sparks plugs so I did not replace them. Throttle is more responsive especially in sport mode. 0-60 times did not improve at all. My best time stock was 6.0 and after installation I ran 6.0. I did notice more wheel spin from a stop to full acceleration. I tried traction control on and off and same with sport mode but was unable to touch the 5's . Maybe if I remove the box with my subs and the addition items out of my trunk I can get into the 5's but honestly for $300 in my opinion they are not worth it not much of a difference. I will drive them for one more day and if my still unhappy I will be returning and using the cash for a catback exhaust or air aid u build it kit. I plan to swap out the factory intake tube but keep factory air box with kn drop it filter