Are you running an open element K&N or is it like the factory sealed air cleaner? Going for an open element filter is bad news. It will do a couple of things - #1: pull hot air directly from the engine bay. Guaranteed to kill performance. #2: decrease the length of the air intake tract. Robs engine of torque. They can also do some other scary things. If you get a backfire through the carb, it will roast the filter foam. Gets sucked straight into the engine. They also have a tendency to shrink. Air will bypass around the bottom edges of the filter which completely voids the filtering efficiency. It is better to use the stock air cleaner and lengthen the intake pipe. It will help to improve torque.