help choosing the right intake

[95-GST]

HI guys, I need some help picking the right intake for my 95 GST. I plan to upgrade to a big 16g within the next 6 months. I looked into dsmtuner's for intakes http://www.dsmtuners.com/parts/defau...cPath=3_141_53 and I thought that it was only a matter of minutes, but then I realized that there are different sizes (2.5",3",4") or hings such as w or w/o MAS, vent or not......I don't want to buy something now and buy again later once I upgrade the turbo, unless is need it.

I also checked the tech articles and find one about (http://dsmtuners.com/forums/showthre...threadid=57364) pipes, my question here is if the turbo inlet pipe they show goes in the same place as the intake piping.....so I assume they are the samething (silly) .

Some people just buy an air filter and cut some of the snorkel (and do the dump tube mod) and other people buy a fipk from K&N for $129......is there any major difference or are this two totally different things and I don't make any sense right now. I don't know a whole lot of things and Im kind of new on this scenario, so please feel free to correct me at any point. Thank you.......