Just bear in mind that if you change your intake then you will need to recheck your tune. You don't have to get rid of your maf sensor and you can leave it plugged in if you wish as the maf is turned off in the tune. You could just get the bigger pipe and redo your plumbing. I am not familiar with the otr for your set up so cant comment about what is available there. Maybe if you contact all the manufacturers of the otrs. Does your engine have a big cam fitted or is it stock?