9i to 11g: Should I rewrite RBO based queries when moving to 11g?

Hi all,
currently I am supporting an application that has a database in Oracle 9i. In the appklcation, 90% of the queries (both standalone and withing PL/SQL blocks) are written keeping Oracles RBO in mind. There are rules all over the place.
Now, the database is going to be upgraded from ORacle 9i to Oracle 11g. Given that the CBO is no going to be effective, do I need to rewrite the queries so that they perform efficiently in 11g?
Any insight/documentation will be helpful!!
Thank you
Nikhil

Depending on which 11g you are upgrading to, I would recommend you go thru these MOS Docs -
601807.1 - Oracle 11gR1 Upgrade Companion
785351.1 - Oracle 11gR2 Upgrade Companion
HTH
Srini

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