Yup I saw the Milltek one on ebay, but from what I've seen (youtube videos), it doesn't sound that much difference or volume. So I'm not sure about that one.
I just lost a Eisenmann Race on ebay the other weekend, went for £740 at the end! So gutted!!!
Been searching on custom ones but just can't seem to trust them with mixed reviews.
So.... I've kinda settled for Remus Race but then found this Supersprint Race which I quite like.
The best I've found is from motorsportworld.
SUP980743 Supersprint Connector Pipe R+L - £73.65
SUP045136 Supersprint Back Box Left - £452.59
SUP045106 Supersprint Back Box Right - £452.59
Delivery - £14.50
TOTAL inc VAT - £993.34
I can't really justify spending more than £1000 when it doesn't really give any weight/performance gain.