Anywhooo, my experience came when a friend of mine and i, desided to lease a 2011 135i bmw with N54 or N55 engine(i dont remember exactly) and JB it + various parts (inter cooler, exhaust, down pipe, intake ext.) Its a looong story of in and out of the shop and removing and putting the parts on (was done by us, i still remember how to wire the jb chip correctly i did it so many times) and the parts that went where electrical, transmission, clutch, oem exhaust falling off literally. And every time we left the bmw dealership they say its fixed, drive back car gets its normal operating temp( was like 310F, we thought to our selfs wtf the oil rated N.O.T. was 260F) and the burning wire smell is in the cabin again. In the end we found the wire that was burning( what happened is that it was like G1 or so wire running on the top of the engine which caused it to vibrate and bend on one fixed place caused to tear and develop election resistance and heated that spot, in the end we stopped goin to the dealer and went to electric supply store to buy wire and that problem never came back.) When we finnaly JB4 it, car made around 480whp, thats when real mechanical problems started( lasted us 2 weeks of jb4 pleasure ) in the end we just stopped driving it, it just stood in the driveway, 240sx was our dd/race commute again.
BMW Engineering SUUUUCCCKKKK!!!
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Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you.  537whp/496lb/tq@8-9PSI 93 octane
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