Newb question about upper pulley.

[Tygr1]

I have the stock Eaton and a Metco 2.9 or 3.0 with an SCT tune. Runs great.

Can I put on a 2.8 ring and run it without getting a new tune right away? How about a 2.7? Any fuel system changes necessary?

Thanks in advance for any help.

 

[BlksvtCobra01]

You can swap to a 2.8 or 2.76 but I would stay out of boost till you get a retune.