Hey Guys, new contributor to the forum, but long-time reader. I just bought an almost brand new DRZ400e so I have something to ride with my son. My father (67 year old enduro riding stud!) has a DRZ400e and I have enjoyed trying it out. The only thing I'd like to get is just a little bit more low end, but I don't want to change pipes if it increases loudness. I've read some miscellaneous posts about increasing the breathing through either drilling or removing the airbox cover. Anybody have any experience on how this impacts the power/torque? Is it better to drill or remove? Does the carb require any adjustments? Any other ideas to improve performance without radical surgery? Thanks in advance for the help!