cdx21

Hi all.This is my first post in @ nissanforums.com.I have a Nissan car that comes with the QG15DE.I know some of you guys might not of heard about this engine at all.You guys would be used to the QG18.Basically it's just about the same engine I think except the stroke *I think* is longer on the 18..or something of that sort...either the bore or the stroke.What I want to know is what kind of N/A mods can I perform on this little engine?I was think of P&P and a larger throttle body (if possible>from what engine?QR25??) to start with.Would the QG18 headers(or turbo manifold in future) fit?Also, is the manual/auto transmissions for both engines the same?Could the QG18 manual/auto trans fit on the QG15? Where can I get manual tranny aftermarket mods (clutch,flywheel etc.)?Are shortshifters for the 18/15 available?Maybe the little guy would be turboed in the future.....would the GT28R that's recommened for the QG18 be overkill?