500?! Wtf better do your mods first then. That's why I learned to just tune my own **** cause I'm cheap lol. An no you don't need to do the gasket once AFM is turned off but its good to eventually do . I'd strongly recommend you take care the motor mounts too. Those suck major balls as well. Amazon can be sourced for pretty much all the parts.
Id get that factory downpipe done before you're tune as well. There's a lot of room for improvement and tuning these cars really makes it a lot more fun. Make sure you also get the plugs and words taken care of first. NGK tr6ix and msd wires have working great for Years for me
