Regardless what make of the vehicle. When you go to upgrade “camshaft(s) and valves” and “valves”. What gives? The previous editions of forza I was under the impression that the “valves” were opening the heads, so just saying, of you upgrade the camshaft and VALVES then upgrade vales again “separately”, how many times are we upgrading valves? Lol.
Dont get me wrong I love the game to death but its one of those, if your gonna do something, do it right kinda deal 
Sadly, tuning has not evolved in this game over the iterations. It is still as basic as ever. And what irks me the most is the fact that in previous Forzas, you’d have clear audible differences after performing upgrades on your car. FM6 doesn’t simulate that, thanks to T10’s obsession with lots of cars.
I’d buy the game whether it has 50 cars or 500. But at least put the love into each car in terms of engine/exhaust sound and UPGRADE sounds. Too many cars with the same engine configuration sound the same. You do engine swaps, they sound the same. But gosh it bothers me when there’s no change in the audio character after upgrades. Sorry, didn’t mean to hijack the thread but they’ve got to address this. They have to. Join the “save Forza” campaign!