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There are vendors selling the 3-stage intake and tune for the N52 engine so it is a pretty common and moderately easy way to gain 40 HP. Which is not an easy thing to do on a NA motor!
I'd put the presence of the M Sport suspension right up there with the si motor in terms of importance. I'd also suggest leaving a bit of funds in the wallet for a limited slip differential, if you intend to use the car as intended. That was the thing that I missed most on my 3.0si coupe.
Manuals will be harder to find than automatics, although there should be a good enough population of roadsters to make the search productive. (Manual coupes are hounds teeth.)
I think the two big items to look out for are sticky steering rack on older examples, and convertible top operation. The motor is in a place that can get wet and is a frequent replacement item in cars that have gotten as old as these. Plus the usual stuff like decent service records, number of previous owners, yada yada.
Good luck!
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