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Are they gains from using a 20-39 over a 21-41 in 660', and also did you try the sw intake are they any better than the box mod,( i put on the dp kit and reeds) didn't try the box mod yet.......thanks B)
 

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Highlander

On the gearing 20/39 =109.28 mph - 21/41 =109.15 mph Flip the coin Speed werx with 2 thunder product gate vents +2 hp on dyno 5 thunder product gate vents = +2 hp on dyno
 
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