Hi ive managed to get my money back but im also looking at another brand now, have a look at the attached link https://www.facebook.com/pipewerx/?fref=ts second video down and the link to the price http://www.ebay.co.uk/itm/Pipe-Werx...369073?hash=item259c1458b1:g:9HIAAOSw2XFUgYN6
Pipewerx are ok but you get what you pay for. Arrow brand is very good quality and you'll get the same money back for it. I'm afraid you won't with Pipewerx.
The reason im looking at the pipe werx is its a lot closer to my budget, i will have to see if i have the extra spare cash when i get paid 3 weeks into January? but if it sells before then i understand.
The Arrow GP2 is seriously loud without the DB killer and sounds stunning but didn't sound as good with it fitted.