I fitted extractors to our Aussie version of the galant, the 380.
It now makes just a fraction over 260Hp at the wheels.
(thats about 195 Kilowatts at the wheels.)
Here is what the exhaust sound is like.
I love the car to death, it's a credit to mitsubishi quality control.
http://www.youtube.com/watch?v=MMCnBCM4rrA
enjoy.....:)