I wouldn't worry about doing anything IMS-related off the bat..... Chances are pretty slim that it will actually break. Wait til it needs a clutch, then get in there if you must.
Also, be aware of which cars are covered by the IMS class action settlement, it could be helpful in your buying decision.
It's your money dude, but I see a lot of dying boxsters for sale cheap because someone bought them without really understanding the upkeep costs and got caught by a wave of issues that wound up crippling the car.
Miata's on the other hand, will be more fun on the track and on the road if you stay legal (because you can actually drive them at 10/10ths), cost 1/4 as much to buy and even less to maintain with all the parts available.
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"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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