Dear,

1. For islamic loan, there's a few products out there in the market.

-For islamic loan there's 2 package for it, that is Bai Bithaman Ajil (BBA) and Musyarakah mustanaqisah(MM).

Your HLBB would be MM

For BBA there's a max cap amount that you pay.
example
RM200K LOAN/ 5.5%/ 30YEARS =Installment RM1135.58

Total price to be paid is = RM1135.58 X 30 =RM408,808

-This price stated in the contract will be the absolute price, the fixed profit has added into the total payable amount. For loan settlement, for usual loan, you will just need to pay off the outstanding balance stated in the bank, but for BBA product, the total final price has been stated in the contract, hence when fully settle, BBA will gives away rebate on the selling price which is equivalent to profit not realized. There isn't any clear formula for the rebate though...

Musyarakah mustanaqisah
-tries to be the complete and newer version of islamic loan
- it is similar to conventional loan in terms of interest calculation, interest rate, early repayment and capital repayment. The difference is this loan is a Profit loss joint venture for you and the bank. Starting 10% (DP) will own by you and 90%(bank purchase) own by the bank. Throughout the loan tenure of paying installment, bank will act as leasing you the property, you will slowly pay the installment(rent) to the bank and slowly owning more %shares of the property.
2. For the difference between conventional loan and islamic loan

-It's pretty much the same thing but with different expression
- for the lock in period issue, islamic loan doesn't have lock in period but certain banks had lock in period, so kinda quandering issues
- Yes there's a capped on the interest rate 9.99% for islamic loan
- 20% more on the legal loan fees, as more paper work have to be done via islamic loan
- syariah compliance
- Most of the banks offer only semi flexi for islamic loan though...

No it will not affect your disbursed loan however if you fail to pay your month installment then the bank have the right to
1. increase your interest rate
2. blacklist you
3. foreclose your property