should I elect out or do not elect out with CPAR?

The decision to elect out of the Centralized Partnership Audit Regime (CPAR) depends on your specific situation, and it'd difficult to say if you should or not without knowing your full partnership situation.

CPAR is a tax audit system that applies to partnerships. If you elect out, partners would be audited individually instead of at the partnership level. 

Generally, electing out may be beneficial if your partnership structure is relatively simple and you want each partner to handle their own audit matters.

On the other hand, staying in CPAR would be better if your partnership has a complex structure and you want to simplify the audit process by having audits handled at the partnership level.

The election is made annually, so you can choose different treatment depending on the tax year.