I am wanting to push my stock wheels out to the edge of the wheel wells. I think from the factory the wheels are too recessed into the wheel wells.
Does anyone know what size of spacer is best and if I need to roll the fenders?
Spacer size: 5mm, 15mm, 20mm, 25mm. Which one?

 

This section is for series 2 RX8s. Yours isn't.

 

Furthermore, there's a member who just put spacers onto his stock wheel setup, go to the Series 1 section and it should be on one of the first two pages

edit: Here ya go, you don't even have to look, just click this link

https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/25mm-spacers-stock-wheels-245-40-18s-%3D-flush-195496/