Yoshi R77's versus Akrapovic 4-2-1

[Krusty]

Thanks Steve for the input.I'm looking into the pros and cons at the moment,I'm trying to stick with a 4 into 2 system but not necessary original.
I was checking performance charts on their charts and thought Akropovic was only slightly better
yours running at 181 is better than their results.Did you change your headers?