No offense, but all the mods you did are not really useful. Changing to iridiums, do you feel a difference?
As mentioned, LCP gives minimal results
Plug cables - Any reason for changing?
Cam pulley - any difference after installing?
421 - Understandable .

EVERYONE will ask yo to do an ECU reflash :

KilleRom Street aKa StreetRom (Stage 1)
- Power enhance above 3k RPM (ignition timing and AFR)
-Removed Speed Limit (default is 184km/h +/- 10% + 10km/h tolerance on the speedometer)
-Higher REV limit 7500 Rpm (does not mean you need to rev all the way)

KilleRom Ultimate (Patch) Stage 2
- Power Enhance from low range, more linear power till 7500 RPM
- Enhanced Ignition Timing and AFR MAP
- Open Loop mode on demand (TPS controlled instead of load)
- Removed Speed Limit (default is 184km/h +/- 10% + 10km/h tolerance on the speedometer)
- Higher REV limit 7500 Rpm (does not mean you need to rev all the way)
- Improved fuel consumption (depend on how you compensate your drive)

Pricing:
1st Stage Reflash comes with Stage 1 rom which is KilleRom Street + Sensor calibration and reseting stepper motor.
RM750

2nd Stage Upgrade to KilleRom Ultimate
RM150

jerry : thanks

reef : Before reflashing, the difference between an open pod and oem air filter may be only 1hp.

But witt reflashing done, the difference between an open pod and oem air filter may be 5hp.

As for exhaust, please refer to steve as i'm suffering from information overload