Here are some things I look into that may help.
I've tested by mixing V Power with Ron97: better response.
K&N drop in: Installed. Some mid range improvement.
Crank pulley: Next project. Now fundraising.
Spark plugs : any recommendation, sifus out there?
Extractor : does this help? will it increase the engine temperature?
Plug cables : Is it true the thicker it is, the better?
Grounding kit : I believe this has some effect in the electrical supply.
May everyone suggest?
instead of installing all this small gadgets that will cost you some $ but yet no obvious result....try la Bolt On Turbo or SuperCharge... sure effective one!