just looked at my predator, the air flow goes up through the filter and horizontal to the carb, so what would make a difference iof a hole was cut in the back of the airbox., those two round plugs on the bottom will let any h20 drain out

 

Prob wouldnt make a WHOLE lot of difference..i just dont think i would take a chance at it...just my opinion..and you know what they say about opinions..[img]i/expressions/face-icon-small-wink.gif[/img] (see sig)

 

Scott, another suggestion would be to go with Dynojets Kit that just became available. I recieved mine today, they don't suggest modifing the airbox at all. just a filter change. I'm not going to install it because I'm waiting for the Set up from Gary from supershops. I don't do any wet riding so it's not a concern. I've had nothing but luck with Dynojets kits in the past, from ATV's to Harleys. Call Dynojet and oreder there kit. Or buy mine from me, which ever, I think this is what your looking for. Putt

 

Putt- What filter is Dynojet recommending to use with their kit. I know WhiteBrothers is working on a foam filter other than that and K&N I dont know of any others out yet. What all did they send you with the kit? Mains, needle, drill for air screw hole? More info please and how much for your kit you have?

 

Kit contains new needle jet, eight main jets and the bit to expose the mixture screw. Most of Dynojets R&D I've heard is mostly in the needle, Putt

 

I just ordered a slip on for my Pred from HMF and the engineer there said not to modify the factory airbox
due to the fact that the Pred uses a CV type carb and is very sensitive to inlet vacuum signals. Uuuuuh???
But at least I do agree that I won't be cutting up the stock airbox. The Rath solution is kinda cheesy for my taste.
The HMF slip on calls for a 155 main jet starting point.