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I am wondering if there are strengthening mods in the gearbox at that horsepower. I was told that the stock box could do 600..That HP is kind of right at the limit of what I would say is reliable. Keeping up on the oil changes after each track day and looking for metal debris in the gearbox and front diff oil will help you see the problem coming before it becomes an issue. The engine oil consumption is the indicator of engine health on a vehicle like that. Without a doubt I would recommend a pre-purchase inspection that performed a leak down and compression test on all cylinders. The shop I worked at upgraded a 996 to 600 HP and that car still drives around today with the stock gearbox and bottom end, but was responsibly driven and enjoyed.
- Casey
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