Any custom, hands on, tune will be better than any "remote" ("mail order") tune--assuming the tuner knows what they are doing. This includes any DIY tune done by someone that has taken the time to learn how.
There is no rocket science involved in tuning an ICE, it just requires knowledge and experience both of which are easily gained by reading some books (Greg Banish's Engine Management: Advanced Tuning is a great start) and doing it. Proper tools are of course also necessary, which BTW is all a dynamometer is--just a convenient tool for monitoring progress...
- 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.
New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq