Wow thats wonderful, where you from? i 99%sure you ain't from Malaysia... or at least not local.
By the way, you can't do much to a Altis. One thing's good thou, Altis is extremely light, hence you can further on from Altis' lightweight construction. Throw off the spare tyre, move your batteries to the back, change to lightweight bucket seats, carbon fibre bonet and boot lid. I believe by then your car will be sub 1000kg. That'll perfect for such a car.
17" at the front and 18" at the back, twin mufflers. walla!
Oh, NOS it.