my son has bought a xr1200 does anyone know of any slip ons for the exhaust system .rather then replace the whole system

gives you an idea what available:

www.adrenalinmoto.co.uk/prods/xr1200-exhaust.html

There a few XRs around running with the supertrapp universal slip on. 4'' UNIV. 1.50''ID,1.75''CORE,ALUM,8DISC< color="#cc0000">412-1500
They perform well very tuneable weigh nothing. At around $300 a pair from the States ( plus freight ) They are hard to beat. It is advised that you run some kind of tuner or even the Inline Enrichment from nightrider as they run very lean.
marx