some of the old timers will remember phil dermer, who was the first alpina dealer in the us. dermer started out somewhere in mass, and had a deal where he was going to build a bunch of performance 2002's. he took a lot of deposits, then absconded with the money. dermer made a turbo kit for early 2002. it was crude, and i had one. used the old solex 1 barrel, it was a draw thru. for boost control, it had an impco(?) spring loaded valve, and excess boost, which was AFTER the carb, so it was fuel laden, was piped back into the carb. old rajay turbo, hung from the right front of the engine. i remember i could bury the speedo, and i think that was at 5 lbs boost, no intercooler. i did have a water injection system, tho. i thought it ran pretty good, but it was a really long time ago. it all bolted on to a stock motor. then there was a guy in california, doug fraser. his kit had a cast manifold, dermer's was a welded up concoction. dfre was the company, and a short time after fraser became kinda established, i think he was killed in an auto accident. his kit was a blow thru, and used a weber 2 bbl. i think it was on a 73 i had, i dont quite remember the year. again, no intercooler, and the same type of bov, no wastegate. this system had a problem of at about 6 lbs boost, it would pressurize the float chamber, and blow the fuel back. again, stock motor, just a bolt on. however, the right side idler arm bracket had to be "modified" because the turbo hung down. part of the tube had to be removed, and the bushing had to be shortened. of course, the crossmember had to be removed for this. at wot, the engine would torque so that the turbo would then hit the top part of the idler arm bushing, and the heat from the turbo greatly shortened the life of the bushing. as we all know, those suckers are not fun to change. as i remember on both systems, 5 lbs boost really woke up the engine. it was like second gear felt like first, third like second, yada, yada. on the dfre car, i also had a 320i 5 spd, and one of the last 40% lsd i got out of germany. i remember that lsd was only 360 bucks, the mark was like 8 to a dollar. the good ole days. but no fuel control took it's toll. the engine lost a wrist pin clip, and one cylinder was scored from the pin. the engine was trashed. it sure was fun, tho. the problem with turbos is kinda like drugs. you get addicted, and then you keep searching for "just a bit more power".