I'm eyeing the Competition Evo (part # 71160CKR): https://www.arrow.it/en/assembled/1502/Suzuki-GSX-R-1000---1000-R-2017 on Revzilla, they explicitly call out the 71160CKZ (non-Evo) as needing to be tuned but the Arrow page shows the tube being larger for the CKR. The CKR is more expensive too. (Note: I was going to get the bike tuned regardless of which one was bought). In short, what gives? I feel like I'm missing something here.