Shifter karting has CIK Level 2 baseline plus discipline-specific extras at the top tier:
- SKUSA Pro Shifter / KZ: CIK Level 2 minimum. SuperNationals KZ class requires additional SFI 3.2A/1 abrasion certification.
- WKA Pro Shifter: CIK Level 2 across the national series.
- USPKS / regional shifter classes: CIK Level 2; some series may require specific abrasion patches.
- IAME X30 Shifter: CIK Level 2 across the IAME USA East and West regions.
- Stock Honda Moto Shifter: CIK Level 2 minimum.
If you're stepping up from non-shifter to shifter, the suit is one of the upgrades that pays back fastest. Same fire rating, but the construction differences (reinforced shoulder, cooler liner, paddle-shift stretch) matter for the longer sessions and harder physical work.