The 3 into 1 exhaust was created by an Austrian firm Sebring for the Speed triple race series held in ´95 & ´96. The exhaust is 54mm dia and constructed of stainless steel, saving about 8 kg over the existing exhaust, however it is purely a race exhaust. I bought my triple in ´99 and it came with this exhaust fitted, which although sounding wonderful, to me, attracted every cop car for miles around, so in the end I was forced to fit a road legal end can to the Sebring headers and link pipe. If you have understanding cops, then enjoy, but in England, ypu´ll get nicked for sure!!!