What's the rest of your setup, is it totally stock with just a upgraded chip ? If so and it runs good I would say no but if you have made other changes such as injectors and so on you may want to get a tune to get the most out of it. I have talked to a few people in my area who all went to the same shop and it looks like the going rate is somewhere between 400-800 depending on what all parts need replacing, if my car was stock I would just put that money into a scanmaster, maf upgrade, bigger injectors, or a alky kit. I have done all the usual upgrades to my car and haven't made it to the shop to get tuned yet and it still runs down anything on the road, can't wait to get some extra money and see how she will perform after a professional tune.