Test pipes non res vs res
 

can someone with experience talk about the difference between the non resbeing more loud and how much louder. 2x, 3x...etc

its a significant difference, a resonated pipe cuts rasp by more than half. in the past when i switched from straight to resonated it cut down virtually ALL rasp. I will never get a straight pipe again, sounds like chit

Any evidence of a difference in power?

nope not at all! not like a HFC vs a straight pipe...