I paid $500 for mine on ebay and installed it myself. I had a problem with the resonator rattling after 3 months so I had that replaced with a straight pipe. I have to tell you, I LOVE THE WAY IT SOUNDS. Everyone that hears it in person also agrees.

heres a video with resonator replaced with a straight pipe



this was when the exhaust was new(with the resonator) it will get softer after a couple of days also in this video I chose to make the it next to a building so it sound louder.

 

I forgot to post up here after hearing Rolandos (ReaLZ1) Greddy exhaust. To my suprise, it is very tame. For some reason, I thought it was going to be louder. I didn't get a chance to hear it under load (outside of the parking lot) but from what I heard, it has a very nice deep tone to it. More like the coupe stock exhaust. Thumbs up if you don't mind a single larger tip out the back vs a dual tip and don't want a loud exhaust.

 

https://g35driver.com/forums/g35-sedan-v35-2003-06/190116-aftermarket-sedan-exhaust-compilation.html

 

Wow, that Greddy sounds an awful lot like my HKS!

 

^They are similar in the noise levels...not too loud