BMW built about 2.4 million E30s, so donor cars are still around $14,000 to $20,000, and the light, simple, rear-drive chassis takes modern engines well. That's why it's a favorite for S54 swaps and restomods, from garage builds to Redux's £350,000 rebuilt M3.
RWB, or Rauh-Welt Begriff, is the one-man wide-body Porsche shop of Akira Nakai from Chiba, Japan. He flies to the owner's car, cuts the fenders freehand and bolts on flares over about two days. A 993 kit with installation starts around $28,000, before the donor car.
The air-cooled Porsche 911 was built from 1964 to 1998 on one basic body, which makes it easy to backdate, hot rod and rebuild. Outlaw builders like Emory Motorsports and Magnus Walker opened the door, and Singer and Gunther Werks turned the idea into cars priced from about $475,000.