Stock one is sufficient, you would do better by upgrading the filter and intake tubing itself. Use a smooth, composite intake tubing and a good quality cotton filter. If it is still there, remove the hot air diverter gate and cap the hole that the hot air tube plugs into. That is the biggest intake bottle neck that you have. I've personally been using a round K&N intake for over 200k miles and it has been excellent. Never replaced it, just cleaned and re-oiled. There is an obvious difference in engine sound when using a nice oiled cloth filter. If you have ever driven an early 80s GM truck with a properly tuned Quadrajet and romped on it to open up the rear butterflies, that is the sound you get with an oiled cloth filter on a TBI engine. A deeper, more pronounced exhaust note even using stock exhaust. I get irritated with the whistle that also comes with the oiled filters but it is only noticeable when maintaining a constant low RPM.
My filter:
You must be registered for see images attach
You must be registered for see images attach