Mitsu suggest 60,000 mile replacement. Only way I would change it sooner is if you run big cams or have raised your rpm limit above stock. Both of which will put more stress on the timing belt.

 

Naah. Just replace it at 50,000mi. The reason that DSMs have a bad reputation with respects to timing belts is because most places don't know how to do it right. Nor do they replace all the parts you need to.

There are two timing belts that you have to replace. The balance shaft belt and the regular timing belt. Then you also have to replace all the pullies and the hydraulic tensioner. Do all of that, and get the tension right (not hard, but you have to know what you are doing), and everything will be fine.

 

When you do replace them, use kevlar -- The kevlar belts are a bit difficult to initially install because they have very little give to them. They seem a bit loose at first but tighten up quickly by themselves after minimal engine run in. Be prepared for some extra underhood noise until the engine warms up.

 

The stock belt works just fine, even with a ton more power, and 8500RPM. But I'm sure that the kevlar options work as well.

 

well, the 04 edition is going to have a 100,000 mile waranty, but it probably wont cover a timing belt snap...