Just bought an S for the track

[MikenOH]

Good for you--I think you'll enjoy it.

One question--how many miles?

I know you are trying to keep the mods down and adding a third radiator is a good way to go, but have you thought about doing the IMSB change out and/or various things you can do to prevent that from becoming a problem?

Here's one place to start to gather info but certainly not the only one:
Products: Performance and Enhancement Products for your Porsche