As I'm building an XRAY X12'26 for myself, I thought it would be a good opportunity to list my top 5 favourite option parts for the car:

1. 373583 - C=1.7-1.8 - TAPERED REAR BUMP SPRING - To improve initial response and on-power steering, for medium to high grip surfaces.

2. 373585 - C=0.9 - GOLD SIDE SPRINGS - To improve initial response, steering and direction change, on medium to high grip surfaces.

3. 372260 - 4 DOTS - 0.5º KINGPIN AXLES - To smoothen out the car, and to improve corner speed mainly on CRC Black Carpet, both for both stock and modified.

(Side note - I use 1 DOT - 1.5º mostly for ETS carpet).

4. 375222 - FRONT WHEEL AXLE 1mm LESS TRAIL - Improves cornering speed for both stock and modified. Less initial steering, smoother handling. Car will scrub less speed in corners.

5. 376335-L - CARBON SIDE BRACE 1.0mm (2) - Improves not only overall grip, but also the drivability and feel for most conditions. Increases the chassis flex of the car, compared to with the 1.6mm standard braces.