yeah its a pity that there's not much avail. for the AE112.I'm driving one myself..its a great car to drive arnd..but lacks that bit more power..
currently in talks with my mechanic to source for the Hi-tech extractor...which is gonna cost abt close to $500 fitted..other than that..my mods are pretty much the same as ur mates..sri and cat-back exhaust.
good luck with the mods dude :P