Yes funfer, operating under Customs Licenced Warehouse rules is possible for new and used car imports via AP. Doesn't apply to CKDs.
The tax breakdown is actually in the sales quotation if you ask for one. The excise duty and sales tax have to be shown there for Malaysia My 2nd Home purposes. Most people don't ask for a quotation, as they're more interested in the deposit, finance and monthly instalment figures
I dug up the quote I got for my 325i Sports:
RM203,017 Govt approved nett selling price
85,644 Excise duty
19,911 Sales tax
1,228 Registration, road tax
RM309,800 OTR selling price excluding insurance
We can work out from the 90% excise duty that the CIF cost of the CKD parts is 95,160. With 10% import duty, the landed cost of the parts is 104,676. The import duty may be less if it's true that our CKD E90s actually come in as SKDs from Thailand, as someone once said in this forum. The Thai value-added component would then be at 0% under AFTA CEPT.
So what needs to be filled in is the gap between landed cost and govt approved selling price, or 98k. Let me try to take a stab at it:
25k Assembly plant charges, including painting
2k Service tax on the above
10k Locally added hardware (RFT tyres, batteries, first-fill fluids, etc)
5k Locally added software licences (firmware, sat nav DVD, etc)
30k BMWM margin, including BSRI, warranty, and financing subsidy costs if given
24k Dealer margin, including pre-reg discounts if given
2k SA commission
The above is purely my broad-brush extimate of course, and I may have left out some cost components. Dealer margin is actually quite low and dealerships have always made more money on spare parts and servicing than on selling cars.
So my estimate of the tax component of the RM309,800 CKD 325i Sports: Excise duty - 86k, Import duty - 9k, Sales tax - 20k, Service tax - 2k. Total 117k or 38%.