Brandon240sx

One of the rubber boots is ripped on my ka-e intake. It’s the rubber boot that connects the “air cleaner”, which is the part of the intake after the throttle body, to the intake itself. Either way I’m looking to grab an aftermarket intake pipe. My question is, how restrictive is the oem airbox? I currently have a k&n filter in my airbox and removed the resonator to allow the airbox to get air a little quicker. Do I keep the airbox or grab a cone filter? For a full intake or pipe alone, what should I look at getting? Not looking to spend too much since it’s just a stock ka-e just want to get a little bit better airflow