After x pipe....

How will the addition of x pipe change what you are suggesting? Wondering.....
This carb,
https://www.summitracing.com/parts/hly-0-80803bkx?seid=srese1&cm_mmc=pla-google-_-shopping-
dont know Vac. yet. As said had no port to check. Am remedying it.
And how do the jets have anything to do with idle?