In response to a couple of people who asked about this here's a variety of replacement mirror textures that will increse the quality and resolution of the cockpit mirrors. rFactor Hi Res Mirrors Download
There are 7 versions of increasing resolution from pretty low (512 x 64) to ultra high (4096 x 512). The higher ones will have a small impact on frame rate so experiment to find one that looks and works well on your system. I suggest you start with 2048 x 128 and take it from there. How to Install:
To install a mirror for a specific mod then copy the chosen mirror file into the mod directory (Ex. Gamedata\Vehicles\ILMS) and rename the chosen mirror file to: MIRROR.BMP
To install a mirror for every mod (globally) then copy and rename into the top level vehicle directory (Gamedata\Vehicles)IMPORTANT
You MUST rename the chosen mirror file to: MIRROR.BMP otherwise it WILL NOT WORK!