i bought a b16a sir-2 witch came with a b16a tranny i am no longer using the motor as i bought a much better set-up but i'm still plannig on using the tranny witch i bought an lsd for its for the 99-00 si but the guy told me it would difinetaly work so when i went to install it the final drive bolts from the stock diff. dont line up with the other one so i'm wondering if i have a b16a tranny after all but there no numbers or tags or nothing? it says ysk-1 on one spot thats it? i heard that for some reason some of the b16a are diffrent in some other forum but i guees i'll need to get the b16a final drive but then i probably have to change the countershaft as well?