anyone know of a good spot to find upgrade advice for the 4.2?

 

Have you searched? This has been covered many, MANY times.

In a nutshell, your mods/upgrades will center around non-engine things (suspension, sway bars, brakes, interior, etc.). Because it's naturally aspirated, the 4.2 does not lend itself to significant performance improvements. Upgrading the exhaust to the RS6 exhaust is the one thing that seems to be popular.

Suggest you search for any post by Boston Driver and follow the link in his signature to his registry page. He's done quite a few mods.

Welcome and good luck.

 

Here I am! LOL! Anyway, Southboro nailed it..not much you can do to improve the engine output (isn't 300 HP enough anyway?) , but you can upgrade the suspension, brakes, exhaust, as well as a host of "appearance" mods. Click on my registry page below for more info.