You will pick up some speed, can't tell you exactly just how much since my baby will never see the quarter mile track.
Gas mileage will vary depending on how hard you drive, I found that it stayed around the same as the 3.27's becuase I start quite often in second, am able to pull better in most gears without having to downshift quite as often and use 5th gear more than ever for when I want to drive placidly.
For speedo fix, there are three alternatives.
1. Abbott ERA.
2. SHM Speed Compensator.
3. Superchips custom chip.
If you are a 5-speed you can use all of the above. If you are an AODE, the Superchips is the only thing you can use.
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