i have the agp and i boost 19 and hold 15 so i dont see you hittin 18 and holdin 16 you will have to mess with some vac lines. my agp does get PTB pretty bad though so you may want to try a different brand its the only one i have used from there go with a 3 inch exhaust (turbo back) and an intake. you dont have to have a map clamp if you raise boost but i would suggest some kind of tuning device but you can run with out it i did for a long time but to answer your question yes you can run the WGA without any other mods if you need any more help PM me
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