4-2-1 extractor, hotbits or powerzone, u to decide....hotbits 340 from speedworks, powerzone 440
piping depends on whether u want more pickup or better top end, I don't agree with don't go for straight piping....straight piping(tangki bawah) will give u more pickup and less top end power comparing to the original route, it'll make more noise too and makan petrol. since yours is 1.3, 4G13 should follow i guess 1.75" or less, not more than that....piping diameter isn't going to make much difference though, it's just the bending that counts. That would cost u around 160 for white hose, not white steel... As for bullets, why don't u try a center muffler aka silencer, it looks like your CAT, the size differs very little, thus your system will not affect much and your F.C. will not increase. A silencer costs around 150-250 depends on the brand. I would suggest FGK, Hotbits or Sebring
as for muffler, u want loud or not loud? If u want loud and is not afraid of JPJ's or Police, don't go for any muffler...just straight piping all the way, but damn loud la.
Straight flow, quite loud, but depends on the tabung and the fibre.
S-flow, very quiet and less pickup compare to the straight flow muffler.
Altogether should be around 350 for centre piping and silencer or bullet, 340 for hotbits extractor or 440 for powerzone extractor, 250 for a good muffler...when i say good it doesn't mean the perfect one...
800 is kinda not enough for a good exhaust system, try saving more to opt for a better exhaust system... I suggest u save 800 for the exhaust system for powerzone, extractor+piping+bullet...use back your original muffler though
If u want a hotbits extractor, don't mind to pm me, i can get u a good deal excluding installation....confirm cheaper than 340...