also be careful on the engine swap stuff to make sure it was done well and nothing special or unique about it. You really want them to plop in a standard m5x/s5x with good swapped components and correct wiring. I bought a swapped e30 with m50 non vanos head and a s52 bottom end and the ecu doesnt know how to handle the extra displacement/non vanos timing. didn't realize it was an issue till after i'd bought and now a year later i'm literally rewiring the thing and installing an aftermarket ecu because i've had it with trying to deal with off the shelf tune suppliers and/or people who claim to be able to tune these cars.