he's right about the mallet ... as NigelC and Rattler will confirm ... if you get the pipes retail a lot of places will do you a deal on fitting em, what takes us mere mortals 2 hours takes tham twenty odd minutes ...
and dont forget you may need to change the chip as well to suit ...
as yer in Kent, might be worth giving Neil Spalding at Sigma Performance a call ...
www.sigmaperformance.co.uk He's a member of the DSC, just tell him I sent you, he's Tonbridge way ...
Hope that helps some mate ...
Maybe see you at the Oakdene on the 4th ...