best way to go for a 2002 1.8t passat

what would be the best way to start with getting my passat going. i have a k&n whats next 

I dont have a passat but i have a jetta 1.8t and i got the forge motorsports silicone intake hose and their spliter valve and i just straped a k&n to my maf and although the install was a bitch i am very pleased with the results. less boost fade at higher rpms and the turbo spools quicker. thats the way i went and now i got 14psi all the way to redline

I know AEM is pretty good.  All depends on what you're paying.