I am running uni-filters and a 4-1 exhaust. I recently re-jetted my carbs to 110s, clip in the lowest position, and the mixture screws 1 turn out. This settup was way too rich. There would be black puffs when ever i would get on it. I dropped it down to 105 and raised the clip up one notch. Now it runs great with great pull. I might in the future put the clip down to the lowest notch just to see if it makes a difference. Hope it helps, its really just a lot of playin around.