ok, starting with open pod, source a open pod initially. hehehe. then head to a exhaust shop which does stainless steel fabrication, which also do FMIC pipings, get em to do it. i did mine about RM250 with all the silicon hoses and clamps. a little pricey, cos excluding the HKS open pod. haha.
next, downpipe and dumpipe. i've learnt, do a dump pipe.
down would be to remove the cat con. and dump is for an external exit for the actuator's flap beside the turbine wheel.
for a down/dump pipe, the same guys who can do the air ram, should be able to do this. UNLIKE what you may find in the "tech talk" section of this forum, where apparently SOME CLAIM AND INSIST fabricating a down/dump pipe will take a week, only a hand full of people are SPEACIALIZED to do it and etc. in fact i got mine done very fast and done right.
with that 2 upgrades, your surely gonna enjoy your stock L5/L2 or whatever 660 you have

the upgrades will allow your engine, turbo to run more efficiently. why? stock air filter box is crappy. see how restricted it is? tucked into the corner, blocked from proper air flow. i've read that open pod sucks hot air from engine bay heat. yea of cos. duh. right? but if stock filter box, cold and hot air both TARAK! your engine will wanna run on what? hopes and dreams? so more air, no matter hot cold like katie perry, is better than no air.
and for the down/dump pipe. its gonna mainly allow your turbo to spool up faster, no more cat con. but "forum" mechs will tell you, of but no back pressure. no this and that. so its better to not let your turbo spool? better drive a stock kancil then. with quicker spool, surely its gonna max out faster. but save to say, our JBJL ( not sure about L2 ) are happy revving higher. so what if the turbo maxes out?
and changing a bigger turbo has its perks, but that's a WHOLE different story.......
ps : jason, we need to yum cha and chit chat la...on forum susah. wahahaha

I've removed the cat con the last i changed to the rsr exhaust.
Looks like next up will be open pod! Seriously the stock air box really have a tough time getting air in.
Might DIY heat shield for the open pod, not sure if it helps.
BTW still cant find you on FB. PM me your name/email