Went to 20544 last night, and today was first real test as I did my normal 20 mile country-road twisty commute. Pretty much same impressions. At rpm, much smoother on throttle roll-on out of curves, don't particularly care at all for the stutter when rolling on the throttle at a stop, but something I can get used to I am sure.
"Burble" on engine braking.. I have a lot of it. The sound reminds me more of a water pipe from back in the day than firecrackers. From what I have read on here you all call it a burble I guess.
Sound preferences aside, is it a sign of a problem, or a good thing? I like the sound personally. I have read threads here that say it means it's too rich, and too lean at the same time so that's a touch confusing. SAI burning off gasses from rich mixture makes sense to me I think. Side effects of rich mixture other than carbon fouling?