Hi folks, wee update. I have now fitted the resonated cat back exhaust on my golf.
You are all right, if the exhaust is louder I cannot tell, it might be a 'wee bit' but its too close to the standard sound. On the plus side its better quality, looks better, is lighter and gives a noticeable difference to the throttle response. I got a very good deal on the exhaust so i'm happy anyway.
Thanks guys :)