Hamann7 is right. If you HAVE to cheap out somewhere, DON'T let it be your tune. Most any tune will give you a modest increase, find someone that will give you good service and stick with them. There is a ton of info on this forum about tunes and tuners. Some good, some not so good. Everyone has their favorite. Maybe do what I did, find a tuner with the least amount of controversy and closest to you. 
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03 996TT, 24/18G's, 58lb Injectors, FVD Sport Mufflers, Custom EPL Tune w/Meth Inj.
5.99 (60-130), Best ET-11.14, Best trap-133
Texas Mile 09: 195.024 in 27.4 sec (0-186 - 23.8 sec)
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