If your looking for a bump in performance without going crazy, start with a cold air intake. Then do some NGK plugs and wires, or OEM plugs and wires. Honda ignition systems are great, and when they can support 600hp at the crank, its obvious aftermarket plugs are a waste. Id also find yourself a nice sturt bar, dont get an adjustable one for 10 bucks off ebay, they dont do anything. I have I believe an OBX bar, was a PITA to install, but I felt a huge difference.
Stay away from an exhaust unless you have a nice sounding muffler, dont delete the cat unless its clogged. Exhaust on a D series are only necessary for camshaft upgrades and when you P&P the head and tune for it.
Welcome to the site, its a sausage fest here :lol