HUH ? its EIGHT FREEKIN BOLTS for the intake and 4 for the fuel rails plus unpluging some wireing then you just swap the gaskets and reasemble and it took me aprox 20 minits to do mine if you think thats a "amount of work" i just dunno what to say
as for gains sure naturaly aspirated its only worth about 8 horses at the wheels but thats aprox 12-15 at the motor and the gains only get higher if you add nitrous or cams heads etc later on.
so if you plan on doing much to your car besides the simple cold air pulleys and exhuast they are definatly worth it.