08 Honda Rancher 420 HMF question

Hey guys, I just bought an 08 Honda Rancher 420 that is smoking. So I did a compression test and I’m getting close to 90 PSI. Valve seals? I’m guessing so.
Any way, it has a HMF exhaust, no programmer, with a uni air filter. I’m planning on keeping the HMF, so is there anything else that I need to put with it? Or am I good to go? Thanks