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Depending how old your 6 box is (especially analog vs digital) you could/will see/hear a big difference in the Rev limiter. The old ones sounded like the cut the ignition for 1/2 a second at a time...

I think mostly what your paying for is the better/smoother RPM limit or when your on the chip. If you not running on the chip a bunch like a crate car can, then I don't see a ton of advantage to it...

I could be wrong, but I don't think all the 7's have that just like all the 6's don't either.

The main reason (IMO) is increased spark and reliability over the 6.

One of the things is you could...