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Manual
1. The Automatic has 26 less hp at the engine.
2. Manuals have less loss due to the drivetrain. It's like a 5% power increase across the entire powerband.
This comes out to a 40 rwhp difference between the L99 and LS3 which is significant.
3. The Automatic has AFM that sounds good, but actually ends up with a little less fuel economy over the manual.
15/24 Automatic
16/24 Manual
4. The AFM + VVT of the L99 makes the car more complex to modify, but delivers no real advantage in fuel economy or power output. In fact, with cam installs they convert the L99 to a LS3.
5. For 2013 the automatic is listed as 4 tenths slower in the quarter.
6. The automatic as far as I know has no dual mode exhaust option.
7. The automatic is slightly heavier.
8. I like driving manual and it doesn't bother me. I get to choose performance or fuel economy any time.
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