Exhaust Headers Downpipes Collector Fits: Kawasaki ZRX1100 1997-2000 models. - Ultra light specification pipe work, Tig welded by hand, smooth internal welds reduce internal turbulence. - These weigh in at a feather weight 4.9KG/ 10.8 lbs. - We have used a 38mm bore front pipe with a 36mm internal bore. - Upgraded 4-1 section. - Modern stainless steel flanges for a strong/secure fitment to your engine. - This was designed in 2017 using 21st Century upgrades. - Four engine port gaskets included. - No re-jetting, simply fit and ride. - Silencer mounting plate is removable, allows use of both original, aftermarket or Black Widow silencers. - Accepts your standard Kawasaki silencer or any aftermarket silencer for your ZRX that uses the same bolt on.