Turbo Upgrade??

I have only installed a K/N Filter on the VR-4. If I upgrade the stock turbos to 15g turbos: a) Is this the next best upgrade, b) What else must I replace (due to turbo addition) if I do change the turbo's... Thanks!

upgrade the fuel system i'd get an aftermarket intercooler and a fuel controller, blahblahblah.........yogs we really need a faq, the same ? keep coming up over and over. no offence vr4me

http://www.3si.org/pages/stagedpower.html

this is a pretty good upgrade guide, the only thing I don't agree with is the need for an exhaust/hiflow cat that early. The stock exhaust is pretty good, gutting your precats and getting a downpipe will help alot more than a catback. Other than that, the guide is a pretty good order.