Done some mod on my 04' waja
1. lighten crank pulley (1st gear powerful, expecially at traffic light)
2. 16" rims
3. de-cat + swirl bullet + mitco stainless steel muffler (car more smooth at 70+ km/h; low end a bit sluggish)
4. 4-2-1 extractor (gear shift feel more drag than OEM aka driving manual)
5. replace 2 ignition cable (car more garang when gear shift)
6. use of toyota t-4 oil (car bit sluggish at low end but top speed increase); will try the MItsu SPIII 4L on next flush.
current city drive 9.5l/100km ; pure highway 7.9//100km
the most significant performace mod is lcp, 4-2-1, ignition cable.
eliminate the front "nyek nyek" (after go thru hump) sound by replace the absorber stabilizer bar bushes, as told by my colleague share same prob
some mechanic ask u to change abs, lower arm, abs link....

bloody bullshit. Just try the bushes ~RM60 will solve the prob.
The changing time is very long since have to take out front wheel, loose upper arm, take out lower arm bracket, jus to get little space to unscew & change the bush.
Don think much, jus mention u wanna change that will do, don listen to change other part

cos they lazy to do so.
next level upgrade Brembo disc & GAB HA series
Now left the behind 'nyek nyek' & 'kit kit' when go thru rough road....any idea of all wajarian to solve it?
If rear have sound 'kit-kit', it's due to broken bracket of your bakehose, so need to replace or secure it with fastener.