anak_liar, to fabricate your own downpipe (I'm assuming you are talking about exhaust headers), you need welding equipment, tubing benders and some other misc stuff. Unless you want to experiment with different downpipe configurations, it's wiser to get a premade one to save on all the hassle.
Hi sifus. I've been planning to get an airtrek. Not soon enough, still sorting out my budget. I wanna know, how hard is it to find the parts for airtrek? especially the handling stuff (lower arms, bushes, brake pads...