Exhaust Collector Box Upgrade Fits: Yamaha FJ 1100/1200 all models - Designed by our Performance Department for improved gas flow with no restriction. - Made from 304 grade stainless steel this is the toughest replacement available. - Improved over the original heavy mild steel design, no re-jetting required. - Identical dimensions where it connects with your down pipes and silencers. - Any part that fits your original collector will fit ours. - Weight comparison : Original OEM collector 3kg or 6.6lbs / Black Widow collector 1.1kg or 2.4lbs - Included free complete set of six gaskets four stainless steel clamps, RRP £49.95 - We also make the stainless steel down pipes. - Lighter, stronger with improved performance.