I drove bdjs racing car. He has rear cats and resonator deleted. Its about as loud as id want for my personal daily driver. Kinda sounds like a v6 camaro w/ flowmasters, but a little better. I hate making that comparison but im just being honest. On the upside i didnt notice any bad droning.

Since i like quite exhaust im not going to do this mod unless i see some before and after dynos, because personally im not convinced. 20lb weight saving doesnt outweigh the extra noise to me.

Im willing to bet a rear cat delete alone will not signifigantly change the exhaust note, if at all. Be sure to report back if you do go through w/ it.