Okay, had some time on my hands, and got to thinking about this, so bear with me.
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On this single-tip exhaust system, wouldn't it be possible to mount a turbo at the header flange, then route the piping directly back to the throttle body, with no intercoolers? I used to have a Merkur Xr4Ti, and the turbo system in there went directly from the turbo into the TB, no intercoolers or other fancy turbo-related gizmos. I realize a setup like this wouldn't be the best type of turbo system, but is it doable?
Seems to me that with the right turbo, it should be fairly simple to do? 'Course if that causes a ripple effect, in that the stock ECU can't handle it, new injectors, fuel pump, etc. etc., it may not be worth the trouble. But in theory, I'm thinking it should be an alternative turbo solution, and much simpler to do? This would be something to increase the hp on a daily driver, not a track car for sure. Just an option to try and squeeze more hp from a 1.7.