nitrogen in tires

Would someon please explain to me what kinda Hella vacuum you use to remove all the "normal" air in a tire and replace it with N.
To get all the air out you are going to need to shrink my 39's down to the 15" rim... I think that will do more damage than any dirty air.... :flipoff2:
 
All I can say is if anyone states they're gonna take the time, effort, and expense to run n2 in their tires, I don't wanna hear anything from them about using pipe over tube because it's cheaper... :flipoff2:
 
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