Why 50K? Sometimes they self-destruct at 30K or even 20K, especially when driven only on week-ends. They rarely last past 100K even with rebuilt motors. The brainless morons from Zuffenhausen who designed the POS located the intermediate shaft underneath the rear main seal where it gets all the oil that frequently leaks. Then they used a sealed ball bearing for the IMS. Who uses sealed bearings for engine shafts? Only retards at Porsche engineering team.
The M96 motor is also known for at least 3 different kinds of cylinder failures (d-chunk, slipped liner, lokasil failure). Sometime when you open a "virgin" Boxster engine you find evidence of shoddy workmanship that was repaired at the factory, such as welded blocks and cases or liners in 2-3 cylinders out of 6. The cranks are often poorly balance and crankshaft cradles machining quality leaves much to be desired. This often results in repeated failures of the rear main seal, which eventually necessitates an engine replacement. You are lucky if the boxster is still under warranty when you need a new engine. Most of the M96 engine parts are expensive non-rebuildable throwaway junk, like powdered metallurgy fracture-split con rods. Rebuilding the M96 motor is rarely practical, due to cost of parts and special tools needed for the job. It is one of world's most inconvenient engines to rebuild.
To add insult to injury, the car's performance is best described as "anemic", especially given the price tag.
I would never touch that pile of turd with a 10 ft pole. The only Boxster I would consider would be an older one with a blown engine, they can be had for 3-4 grand (Ouch!). It would probably make a good chassis for a WRX Sti motor. Unfortunately, with the exception of the later model 6-speed manual boxster transmissions are not capable of handling any amount of horsepower over what the wimpy stock engine produces.
A guy who bought a C5 Corvette back in 97 or 98 for less than what the Boxster was selling for now has the car that is worth twice as much. The Boxster resale has got to be the worst in Porsche history, may be next to 914.