well i did the install today
cpi small bores
vforce 4's
uni drop in
290 mains
27.5 pilots
as someone mentioned, the bottom end is sluggish but it pulls like a raped ape in powerband
idle is perfect as well
would changing anything on the mains help me with the low end, i have 310's i could slap in real quick
i understand the pipes are killing me but why not ask