Hello there.

I'm guessing you're not from Australia? Given that cl8s are non-existant here

There's not much options for you. I don't believe there is a tuning option for that k20.

Assuming it's an automatic (most cl8s sold are) probably got for an inake like the comptech icebox which is more low end focused.

And also lightened pulley to help the engine response.

That's pretty much it unless you go for an engine swap.