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the 3.2 is potentially more reliable. better oil cooler, additional radiator, larger brakes, forged pistons (2.5 has cast pistons). also, the 3.2 came later in the design cycle; earlier cars have failures not as often seen in the later cars - d-chunk failure, more prone to ims issues, etc.
the spec series does use the early 2.5 cars, but note that they incorporate many of the 3.2 improvements - additional radiator, larger oil cooler, ims retrofit. I would factor in the cost of these modifications when evaluating the cost of purchasing and maintaining an S vs non-S car.
also, the S has improved suspension geometry, but the shocks are still non-adjustable. and construction quality is the same with both, although trim levels may differ.
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