Complete Big Bore Performance kit including oversize pistons, revised camshafts, Piston rings, liners, gudgeon pins, all gaskets, up-rated clutch springs & the all important 104ci clutch cover embellisher. Increases engine capacity from 1600 to 1700cc (or for USA 98 to 104 Cubic Inches). Huge gains in power & torque! Can be installed in conjunction with High Flow Silencers to create the ultimate Thunderbird. Please note this product should only be fitted by an authorised Triumph dealer. Please refer to your authorised Triumph dealer for fitment times and costs. Requires specific tune download. Approvals vary by market, please consult your approved Triumph stockist.