Increase pickup... thats gona cost a bomb if you want
significant pickup. For those minor untill you can't feel pickup
would be open pod, racing cable,good sparks etc. You will feel
nutting.
The only way is to mod... but mods are normally illegal. Change
engine is one way, straight thru down pipe , exhaust is another way
of doing it. Change forge piston, rod, bore thru etc.
ESI should be quite ok for a 1.6 catogery but maybe its time for
you to go for an overhaul servicing. Could be tooooo long no
service engine already.
Best to be legal is to change a better car. No need worry on TP
& Lta... only worry on pocket burnt... lolz..