There is a bit of maintenance that I would recommend at this mileage:
- Transmission fluid and filter - This is a big one in my book since the transmissions are one of the weakest points of the car. But if you take care of it and drive smart, it should last you awhile.
- Lower intake manifold gaskets - Probably the second biggest problem spot. Anything over 70k miles and these should be replaced. They just plain suck.
- Cooling system flush and coolant change - This fits right in when you do the LIM gaskets mentioned above.
- Supercharger fluid - This needs to be changed every 30k miles or so. Only when the coupler starts making noise should that be changed.
- Fuel Filter - Every 30k miles.
- Plugs & Wires - Depends on what kind you have. But should be changed on a regular interval. I would say every 30-50k miles or so.
- PCV Valve - Just cheap and easy to do every 30k or so.
- O2 sensor - Just the front needs changed every 50k or so.
As for timing chain or tensioner. I don't see a reason to tear it down that far to do. If it starts making noise from a wearing tensioner, then consider doing something. Until then, forget about it. Coil packs and other sensors only need changed when they are acting up, which isn't very often.
Again, this is just my opinion, so take it for what it's worth....which is not much
