It's NEVER too late to start in on the mods! Once they start they never stop
The exhaust would be best served in conjunction with the S1, so do those around the same time. Lol, come to think of it, same with the VAK. With S1 you're upping the boost, and you're gonna wanna get that thing breathing better and not losing boost from the stock ucp so the vak comes in here. But then on the other hand you're gonna wanna get that exhaust to get the heat and whatnot outa there a little better. Go with the S1 first, it's the starting point. Then from there on out just go with what you can afford at the time...either the vak or the exhaust will greatly help out
