i get a nocking noise from the under of my car wen i am driving on bumpey road or old roads i seen somthink on the tele about the exquast touching the under neath of the car does any one have any ideas thanks luke
follow the exhaust down from the manifold, you'll see the cat just undet the car near the anti roll bar. above that is the heat shield, its a flimsy bit of metal - bend it so it's far away from the cat.