Just started on snorkeling my 450 since I flooded belts this past weekend. Got belt intake and good start on belt exhaust. My question is for carb. I see some use 1.5 and some use 2". I have the 2.5" flex hose run under the hood right now. I know this May take trial and error just looking for a few tips. Also I've found plent of photos but could anyone tell me how they are attaching PVC to air box? Thanks in advance.