old td air box too restective or ****ing what

ive had my 200 in for 4-5mts but recently decided to plumb in my snorkle so the only solution i had was use the td air box before i had a disco 300 air box strapped to the spare bit of space by the fip(think this is where the air con compresser goes not sure) but no thats connected up the truck runs like **** but that air box was fine for the td odd what im thinking is there a right or wrong way to connect the old air box up would that make a difference

TD airbox is fine, post a few pics of how you've done yours - what dia CAF have you used ?