We are talking about cumulative gains and have gone through this already. No one is selling anyone anything. My mech works on cars all day every day. He has 30 years in the business. Street and race cars. He did all the work on my 13. Sc, exhaust, headers, etc. My current 13 gets 560rwhp, verified by dyno results. We did the whole deal on the 18(adapters, Cai, tune(MPT 93prx), downpipe, exhaust, intercooler upgrade). He said the gains will be not be as dramatic as the sc obviously on the 13, but it all adds up. Especially in Houston where it is hot as balls all the time. Look i have agreed on here the tune is the biggest improvement, but you cannot tell me that the other stuff doesnt improve the driveability and the hp for the truck. I drove it with the tune only for 2 weeks, then did all the rest. There is a noticeable difference. I did not dyno either one, but wish i would have. These add ons were a total of 4300k roughly, but the truck is completely different in it's behavior, sound, and performance. we can debate all day if you want to, but when you guys get on here and give false info it just confuses people. Just say the gains are negligible, marginal, or hard to determine. That at least sounds reasonable.