If you want to keep an airbox and plenum then you might need to cut it up a bit. Velocity stacks and slip on filters look alot cooler. And sound awesome.
Silvertops are AFM though so if you want to run no airbox, you'll need to go aftermarket ECU aswell.
20v's are more expensive for sure but do make more power from factory. I think if you plan on spending a bit of money on a 16v, you may aswell go 20v to start with. Gain that extra power from the get go.
People will say a 16v has more potential but within a realistic budget, I think 20v is the go.