Typically the dynojets will yield slightly higher numbers than a mustang dyno. Some people say tuning on a mustang dyno is better and more accurate.
The more important factor IMHO is that you use the same dyno throughout the build. This way you know your gains are accurate even if the equipment isnt and your not introducing a different variable into your tuning.
Also, find a good shop. I have dealt with some pretty bad dyno shops and it took a while to find one I liked and trusted.
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