Are “mail order” tunes safe?
The general consensus is that a dyno or road tune is much better. However, if you do purchase a mail-order tune, you are advised to: A) Purchase from a tuner who has a great reputation for 2003-2004 Cobras, B) Ensure the tuner does the tune for your specific mods and for the fuel you’ll be using, and C) Dyno the car as soon as possible after the tune is installed to ensure correct A/F ratios. Speaking of tuning, most tuner shops prefer to tune with the SCT handheld tuning device vs. the Diablo. Having a tuning device more generally used by tuner shops can be beneficial if you move from one shop to a new one.
