Check my build thread if you want to mod your stock airbox into something approaching an SRI. Just depends if you like to inker/hate to spend money or if you'd rather just buy and install.Nothing major for mods... currently reading up on the TB ground and the Buddy Club Condenser's... will probably end up doing one or the other. Also planning on an SRI, upgraded speakers and a small powered sub (something like the Infinity Basslink).
Going to figure out what to do about the rust soon, either grind it off and try to match the paint as closely as possible, or just saturate the area in rust proofing chemicals...