Morning!It has been a very long time since I had the R600 but from memory its the same as stock from a noise perspective.
This box is the best for performance but I fitted it at the same time as going Stage 1 so was not possible to identify it gave extra power (if it does it will be a small amount) however it will give a better airflow to the turbo so will help with how the car performs I am sure.
These are not cheap bits of kit but I personally purchased second hand off ebay and was very happy to save a few coins.
Inside the box on mine was an open cone filter but obviously its fully enclosed so you dont get the whoosh of a normal open cone setup.
Hope that helps.
That's good information, thanks. I was looking on eBay last night to see if there were any used kits out there.
Helping the car breath more easily is always going to help, but I don't expect miracles...I'd just like to improve things without impacting on comfort, and definitely wouldn't want it to sound like a race car.
Thanks for your help.
Cheers,
Nick