Why the hell would anyone want to put the Evo (of old) spoilers on their Wiras? It's :
1. Fugly
2. Makes you like a wannabe dick
3. Heavy
and most importantly it's
still bloody expensive to buy even though the design is easily 20 years old. It's kinda like the time when TopGear put that F1 wing on their "racing" van and instead of making it faster, it made it slower. In the end the front splitter was the one that helped it even though it caught fire since it was made of wood.
Personally I know shit about fluid dynamics or aerodynamics. I just know the small spoiler at the back works and the front canards can really stress the joints on your front bumper. Friend had his Putra front bumper break right off in the middle of Sepang and we all suspect it's due to the amount of aero he installed on the front bumper. Ridiculous angles too. I've never seen a bumper do that, break off at the parts that bolt down to the chassis!
Anyway, if I were to get a spoiler I want the AC Schnitzer spoiler which I haven't been able to source since forever. Last time had a person offer a full CF one for RM750.. damn regret never buy.