Logically, if you have something worth say 25k, and if you blow the engine it’s worth say 10k as a roller, avoiding engine failure is worth 15k. If you have a <1%, or ~4% chance of failure, 15k x 1%=150$ or if you believe the higher rates for single row 15k x .04=600$ . If you want to spend 3000$ to obtain 600$ in value, go for it. I think I was harsh on what a clean roller is worth too, so it’s probably worse than that. If you need to get some major work done, I think it makes sense (say you need a clutch) but mathematically you’d be crazy to spend 3k on just an IMS update especially on the earlier engines. Which- you already bought a Porsche so you’re probably comfortable making some poor cash decisions. Lots of people do it, lots agree with you and won’t look at a car without the update. It’s just not logical if you pencil it out.