How to optimise the Mazda 3 or steps to make cheap power.

In this video I list a bunch of simple often free mods you can do to the Mazda 3 to make it much more reliable and entertaining to drive. below I list the various mods .
1 Throttle body ground
2 clean all the factory grounds
3 Intake resonator removal
4 Why you should keep the stock airbox and the second Helmholz resonator.
5 use a free flowing stock replacement
6 clean the MAF and IAT
7 Replace your old O2 sensors
8 Remove the VCTS valves and change the PCV valve
9 Clean the back of the throttle body and bypass the coolant line going through it.
10 Replace the undertray if missing.
11 Advance the ignition timing.
12 Replace the engine mounts and run a Poly lower mount.
13 Add a short shifter kit and heavier shift knob
14 Run a free flowing exhaust
15 Run lighter wheels