The price varies greatly by brand. Going for the premium brands such as TRD and Tom's will probably set you back more than GBP350-400. Other brands can go to as low as GBP200-250 perhaps.
As a reference, over here, the Blitz Nur S exhaust can be bought for about GBP250, the Apex'i Hybrid Evolution is about GBP310 and the TTE Sports Silencer is about GBP350.
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Email me i have a bran new Blue Flame back box and Middle pipe 2 months old.
Very neat and 8bhp full stainless steel very shiney.
All i am looking for is a standard backbox and middle pipe. But must be in very good clean condition. if intrested email meat Silent@ntlworld.com
Trust me this Blue Flame system i have is mint....