Mmmmm... the aero parts at least are "order made", meaning you order it then they make it. Having said that they're hideously overpriced! Those aero parts are just half spoilers and lip spoilers, but they're at "full-bumper" prices... the hassle of owning a not-so-popular car.
The coil overs are about double the price of new Tein or JIC coil overs, but they are Ohlins... top shelf stuff.
Even the muffler looks pretty ordinary but it's approaching the price of some of the cheaper Titanium mufflers. You might be better of making mods to an Apex N1 (or whatever) muffler to fit your car?
In fact the only commonplace (read: cheaper) parts that you really can't make to fit your car would be the coil overs but at 348,000 yen (A$4,360) without shipping, you could probably ring up Whiteline Suspension to design some coilovers for your car from scratch and still have money over for lunch!