If i get my car professionally tuned do i need a aftermarket chip

nope. there's nowhere to put a chip in your car, it has flash memory soldered onto the board, and it's programmed through the port under the dash.

Ok thanks buddy. I was jw. so once I get tuned that's it computer wise?

On a '94 and up they call them chips, but they are really piggyback modules that in plug in series to a PCM cable. I had one way back when I purchased my Z28 prior to getting into tuning. However stevo is correct a proper tune will do much more and will obsolete any need for the 'Performance Chip'. Sold mine on e-bay after getting my first tune.

Alright thanks bud. That's all I needed to know.