Bigger throttle
 

What’s the best throttle to improve the response of my 99 xl v6 3L ranger? There a turbocharged available for this vulcan motor? Thanks

Have a look here: Tom Morana Racing Engines

The 3.0l Vulcan engine is not a great engine to build "up", if more power is your goal then sell the 3.0l Ranger and get a 2004 to 2011 4.0l Ranger, 207HP
Or look at swapping in a 5.0l OHV V8 engine
Better results for less cost in most cases

No car makers restrict air flow or exhaust flow, they sell vehicles based on performance, so why would they
Emissions has nothing to do the air flow in or out(exhaust), emissions is about the efficient burning of gasoline to minimize pollution