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Location: Japan, where the term "JDM" doesn't exist
Drives : '94 WRX, '97 Forester S/Tb, '95 WRX-RA
I read an article in SCC last year that covered something like this. (Complete technical details are hazy) It involves buying a device that locks the center diff (or just welding it together, which, of course, is irreversible), causing all of the engine's output to be transferred to the rear wheels only, making the WRX a 2WD. Dunno if it made the car faster (1/4 mile times), but it did make the WRX driftworthy. At the end of the article, it was mentioned that the output shaft ended up shearing due to the fact that it wasn't made with the intention of handling all of the engine's power, only about half of it. It was cool to see, pretty easy to do yourself, but in the end, not a good idea. Not sure how this mod has evolved over the course of a year. Maybe somebody has some more-up-to-date information for you than this.
As far as oil goes... Mobil 1 synthetic. The exact weight depends on age of your car and personal preference. Do a search for volumes of info on this subject.
haha.. those two questions were so not related. i love it
you can make your car fwd or rwd, as there are differentials.. you'd just need to lock one of them up to limit the awd. making your car rwd Might makes your car a little quicker (less understeer, a little but of fun oversteer), whereas fwd might make your car quicker in drag. it really depends on the kind of power you're shooting for and what kind of driver you are. in most cases, awd will haul *** off the line