M103s are easy to find, you can easily find them for 500 bucks or less. They're used and haven't been rebuilt but lots of guys are parting out these cars

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth