A number of us On here have used these ....www.jetex.co.ukBought some 1metre straights and a few angles and one small 12" oval box and that is the complete extent of my system on The 1Tonne.... Std 4.0litre...... Quiet but sounds good on the pedal......Just a bit of welding and no u bolt clamps to get knocked loose.... Under £100 for my load of pipe!