Exhaust Silencer Kit, incl Tailpipe & Fitting Kit 1.7-2.0L 72-79 & 1900 Waterboxer T25's. 021-298-053 021298053 £145.00 Quantity: at £145.00 each Add To Basket Complete silencer, tail pipe and all fixings, gaskets etc. Top quality parts. Correct for all Bay window buses with type 4 engine (1700-2000cc) This kit includes everything you need to replace the exhaust from the heat exchangers back Any Bay window with a Type 4 engine of any size. Also fits 1900cc waterboxer Type 25 but the tailpipe is slightly different.