how to add more power to your car

Most of us who live in Asia we usually end up with cars with smaller engine due to the silly car registration being tied to the engine capacity. This naturally becomes a handicap when it come to having enough power from your car's engine to move the weight of the car unless the engine is turbo charged.
Here are some devices that we have tested and proven to work to boost engine power:
- high flow replacement air filter (not open pod)
- Power Mesh (converts nitrogen and helium to oxygen molecules)
- Power Charger (improves electrical efficiency to reduce load on alternator)
- Broquet (fuel catalyst that creates reaction with fuel for better combustion)
- Removing of catalytic convert and replacing it with centre box (less restriction for exhaust system)
- Thicker spark plug wires
- better sparking spark plugs like SplitFire (potentially gain 1 to 3 hp)
- Cyclone (works to create spiraling effect of incoming air), but has limited effect
- micro compressor (leans out the air fuel mixture for leaner combustion, problem is with filtration of the extra incoming air), this device needs to be constantly adjusted to enable it to work properly
- fuel magnets (some with the right polarity works by ionizing the fuel molecules) but has limited effect
- Voltage stabilizers (only effective for older cars with insufficient grounding, at most improve power by 1 to 2 hp)
- Far Infrared plates and wraps (using Far Infrared to radiate the air and fuel molecules, limited effect and can gain at most 2hp)
- changing exhaust manifold to faster flowing type
- ECU remap (if available for the car can be highly effective)
- piggyback ECU (works if properly tuned and is not over written by the car's ECU)
- tuning boxes (if available for the car can be highly effective)
- NOS (confirmed power gains but need to refill tank and is illegal)
- Water methanol injection kits (impressive power gains but need to regularly top up the tank and has to be properly installed)
- TSD Thermal coating for intercoolers (reduces internal temperature in the intercooler, highly effective to improve power and torque)