Bro, let me give you some pointers to reduce noise in the cabin - this is what I did (all DIY) to my 2002 Waja. Now, my car is suprisingly quiet!

1) I removed all 4 door panels and stuck Insulflex sound absorbing material. Put extra thick double layer on front doors
2) One layer of dynamat and Insulflex in the engine bay firewall.
3) One layer of Dynamat and Insuflex in the boot area
4) Change 2 front tires to Michelin Primacy LC

Total damage for insulation: RM250
Tires: RM480
Result: One quiet car! (of course not like Merc or BMW).

Note that you can save yourself lots of $$ by just DIY

Hope that helps!

Haha...of course tires I don't DIY change, change it in Klang:)
Bought the all the insulation material all from forummers in the Automotive Garage section. Got lots of them selling it, just search for "sound insulation".

Forummer "KHGUan" sells the insuflex, you can ask him. PM me if you want the details.

Unfortunately I didn't snap pics la, but its not too hard to do, but takes quite a lot of time though.