Since someone asked about the location of the vehicle speed sensor, it is part of the AL4 transmission and located near the drive shaft. I don't have pictures of my own, so here's some from the internet.
The easiest way to gain access to it is from under the car. Removal is easy, just remove the bolt and slowly pull the sensor out.
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Saturday, February 26, 2011
Saturday, February 19, 2011
How to remove the air intake duct:
1. Remove left wheel.
2. Remove left wheel arch.
3. Remove air filter box.
4. Remove steel bracket.
5. Working from under the car, unhook air box fastener and hose fastener.
6. Detach hose from air box.
7. Remove air box.
8. Remove hose.
The air box had water sloshing inside. I guess it easily collects water in this tropical weather that rains and floods frequently. So I permanently removed the air box and hose, leaving only the air filter box. This created a nice intake roar when accelerating and better pick-up together with better throttle response. I guess the air box and hose restricted air flow.