Well, decision time. The 535is has been sent with my brother to DC so we can restore it and build a turbo motor for it. James wants 500wtq. I'm down with that myself. That leaves me with my other cars to deal with. I dunno what to do with my E30 325i. It is a 4 door and had a pristine body until someone sideswiped a handrail as I was pushing it through the parking lot at work. I am over it, so whatever. It was a $200 car. It is going to be the "beater" car and the road trip car, so it must be reliable and get decent mpg. I will also tow with it so it must have torque and lots of it would be nice. I have a Mercedes supercharger on the shelf that would be good for about 8psi on a 2.5. It has a clutch so I can Mad Max the thing. I may be able to lay my hands on a 91 318i 4 door with a bad head gasket that is black, but that could cost me a grand. Option 1 Build another bottom end for the ported 325i head that I have on the car now. I have it shaved and I don't think it wants to play nice with the 325i bottom end, since it was milled a lot for use on a 325e. I have already installed this head on the car, but there is an audible tapping noise from the top end that wasn't there when this head was on the 325e. I guess I could cut valve reliefs in the pistons and be done with it. This option costs anywhere from one head gasket and a set of studs to a complete rebuild of the 2.7 bottom end in my scrapped 325e. This can also lead to adding a supercharger in the future but it is more difficult because there is no serp belt drive installed. This is the path of least resistance and most likely to result in long stretches of nomodifications. Option 2 I have that M5 semi parts car with a really good S38. It is worth way more in parts than whole. I have the E34 oil pan that I need if I want to drop it in the E30. It would be pretty unique, but peak at 300HP and cost me approximately $3500 or more in lost opportunity selling the motor and I would want to run MS on it. It would also cost me time fabbing mounts and I would have to take a hammer to the firewall. Monetary cost would be minimal. Maybe $3-400. I probably could sell this motor and trans for over $4k. This is the most unique, but in the scheme of things, the most overall "cost." Option 3 M50. I have an M50 non vanos with a "freshly rebuilt head" and can get another non vanos M50 for about $400 if I desire. I could build a 3 liter out of it pretty easily. I can supercharge it very easily as well. This has been done to death, and I can do this in my sleep, but offers a light motor with plenty of torque. The cost would be intermediate. I would probably end up spending roughly $1000 total to make this happen without going 3L or supercharged. Option 4 other- you gotta tell me what you suggest, though. Also, if I had the money, I'd go straight for the S54, but I don't, so keep things like that to yourself.