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Yea, those are sweet adds for sure. I think the best bang for your buck is definitely the 3.91 gearing. All of the things that happen after the ignition are awesome adds because you don't have to change the tune. After you start doing things like meth and larger injectors, etc... things that change the mix coming into the engine... you're gonna have to go custom tune. So, now you're in the same boat as the VF. Between the two tunes you're looking at a 570 vs 525 at the crank, but only getting 80% of each to the wheels, which equals 456 vs 420... so yea.. about 36hp difference. If you're doing the gear change that's a multiplier of your power to the wheels, so that'll bump you up from that number.
I think you'll be super happy either way you go.
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