I can throw in 2 cents here - I can't speak for 2.0's, but I do know that 2.3's that are 'tuned' usually develop slip, because of the pressure plate. Mine had slip with very mild software (229 whp, stock ic, 3" exhaust, snorkel removed and extra holes) on a clutch that had less than 10k miles. Upon disassembly, the clutch had plenty of material left. I replaced the pp with the Sachs Race Engineering one and a stock clutch plate. Now, with slightly higher tuning, stage 4, and ~20k miles, the only evidence of slip occurs from the tires (Firestone SZ-50's, essentially same compound (UNI-T) as the S-O3's, but have a different tread design).
Unfortunately, I heard thru the grapevine that Sachs is no longer supplying the Race Engineering version in the 'states anymore. They certainly weren't cheap - things usually are - and the pricing was very volatile I had been offered one 6 months earlier for a little over $200. 6 mo's later, when I bought it, it was over $500. Mine came from Sweden, but I think it was probably made in Germany. Anyway, if it's still available over there and if anyone has ideas of tuning their 2.3, I'd consider it a must-have, eventually.
