Most everyone on here is gonna say ProHopper, (b/c we've already had this topic.). Which ProHopper is some good quality stuff, looks good, reliable, & they've been around forever. I have their 2pump chrome kit on my Expedition & it does great.
Now, for hopping and other kick ass shit, I'd recommend Hi-Low normally. I have their 3pump Elite Plus kit on my Regal. However, I've heard their having problems over there and if you order something, you might not get your shit......just what I heard. I haven't had anything go wrong w/ my shit in awhile so I haven't had to place an order.
So, for now, I'd recommend ProHopper.....good shit & not going anywhere.