What is the suggested jet for following setup?

2008 TRX400ex

-HMF competion exhaust
-K&N air filter (open air box)
-Elevation: about 2400

Looks like most jet kits range from the 150s to 190s…..

Even an estimate as to where to start would be great. Picking the bike up tomorrow and have the exhaust in the mail.

Thanks in advance!