make sure the bottle pressure is kept up... is he using a ful throttel switch ?? wet kits are a littel safer but i would recomend the zex intake filter... it will work on any after market cai and the line attatches at the end of the filter... no need for taping the intake... should be safe on atleast a 75...colder plugs and a nitrous timing retard bow wouldnt be a bad idea...