Bro manu3116m, I would suggest the following exterior mods, prices are estimates only:
1) OEM Chrome Exhaust Tip, for a nice finish to the tailpipes: Price: ~RM350
2) Blacked Out Front Grills, for a subtle yet garang look. Price: ~RM400
3) ACS/Hamann Roof Spoiler, to accentuate the roofline: Price: ~RM400 for replicas (excl. paint)
4) OEM Blacklines, this will really set your ride apart from the rest. However, there are some who are divided on how it looks on a lighter-coloured car like the TiAg. Do a Google Image Search and you can make up your mind. Price: Special price of RM950 from Stuttgart Motorsports @ Taman Mayang, you have to trade-in your ori tail lamps. Just mention that you are from the forums and look for Ivan/Eddie.
Above items will only set you back just a shade over RM2k.
As your modding appetite grows, you can move on to the following
5) Eibach Pro-Kit Lowering Springs, a lowered E90 looks really nice: Price ~RM1200
6) Bodykits, many choices available - MTech, ACS, Hamann, Lumma etc.
7) Rims, 18" staggered seems to be the best bet for our pothole-ridden roads and is kinder on the wallet...