have the same issue using paul turners and 38mm pwk carbs. at first i was using a flex tubing from napa, i used a 2.5inch nylon pre heater hose with steel reinforcement. then i decided that its a p.i.t.a. called duncan racing and they said "use a air box". so, what are u waiting for? put it back on, and if your stupid like me and grinded the tabs off he said "use the zip ties they use in law enforcement, they are nere bullet proof". good luck