theres no problem with a car being converted to awd because it is just bolting stuff on, no real custom work done.

the 6 bolt and 7bolt stuff is in a sticky at the top of this section

"What is a 6 bolt? What is a 7 bolt? What is the difference? What is my car?
The 6 bolt 7 bolt refers to how many bolts hold on the flywheel. Some differences in the engine's include stock turbo size, exhaust housing size, intake manifold, agressiveness of the cams, and engine managment. While 7 bolt engines can be built up just as much as the 6 bolt's, DSM'ers prefer 6 bolts becuase they are more reliable, and less likely to crankwalk. Generally speaking, if you own a 1g built in 90, 91, and early 92 you have a 6 bolt, and if you own a 1g built in late 92, 93, 94, or a 2g you have a 7 bolt."