Hi,
I was planning to slam my Daihatsu sirion 4trak using an airbag kit, but I haven't been able to find one in England for a decent price. So I am planning to buy a coil over kit and then upgrade later. So far I have found two possible candidates.

BC racings V1 adjustable coilover kit.
http://www.bc-racing.co.uk/v1-series-coilover-type-vm-55.html

And pb brakes coilovers.
http://pbbrakes.com/street-coilovers-kits/daihatsu/sirion.html

I have used kits like these on a friends r32. But I have absolutely no knowledge or experience to go by when it comes to using kits like these on my own sirion.

If someone could point me in the right direction I would really appreciate it. And thanks in advance.