Absolutely love the look of the quad pipes... they are quite imposing as they are all 90mm in diameter... most standard sports ones are 80mm in diameter... The pipes extend out of the rear valance just about right and observers can see the nicely engraved "Supersprint" words on the top part of the pipes... Very nice...
As for the sound, I love it whenever I start up the engine... Previously there was little if not no exhaust note upon ignition... Now there is a nice growl whenever the start button is pressed...makes me feel that the engine is alive and kicking!
On the move, the sound is great with a low rumble that builds up as speed is gain. The turbo burble is more pronounced after installation of the exhaust too. At idle and low speed, the sound is low and bassy... not too loud. But as my car is a convertible, the sound can be slightly intrusive...but still acceptable.
Performance wise I feel the car "breathes" better now... there is more grunt and faster acceleration... not sure if this is psychological... But I believe the exhaust system consisting of the mid pipes and rear mufflers does add a couple of bhp to the car...
Overall, I think the supersprint exhaust is great... in terms of looks, sound and performance... A great mod at a great price!