Hi, as far as I`m aware the X30XE & B308I are all but identical, Ive had both. Mines not the turbo`d engine found in the Saab 95 as in your link (thats the B308E which is lower compression), mines from a 9000 Griffin.
Mine is relatively standard - de cat, larger throttle body, stainless exhaust system & custom manifolds & makes 247bhp & 217lbs ft of torque