if you ask me...
i would go with the 'r3 alike' front bumper, paint the car in a metalic color (i like alittle flake), a small subtle ducktail/lip spoiler, some decent rims and maybe a slight drop (not so much as to make the car silly)
*one thing which is usually considered ahbengish which i do like on the waja are some of the aftermarket lights... get the original hid fronts, and a pair of aftermarket rears*
nono's (to me at least)
+big ass wings - i dont like these unless its on a car that actually needs it OR its a sports car. (i find that sports cars can get away with these but, normal everyday non-track-oriented cars dont look good with em:hmmmm2:
+matte colors - matte black especially, its the road to ahbengness, you will burn in the car, the paint is difficult to maintain and the color does not last long before you see patches (my few sens):vollkommenauf:
+fake brake covers - this is a big nono to me, get the real stuff or make yours look fancy, paint them or something but dont make them a joke by making them what they are not...:thumpdown:
+heck fake stuff in general - includes meters and those stuff (rims i can understand alittle cause originals are so exp and the fakes still do the job but... brake covers and fake meters do nothing)

+ led's all over the car, just dont... i beg you
:vroam: jangan marah ya, as mentioned, each person has their own opinions *runs away*
edit: found a sample... imo looks very nice, does not look corny, no fake stuff, not trying too hard. It is, what it is
https://www.flickr.com/photos/esharkj/albums/72157628042880738