Hi guys I am in need of a drivers side exhaust manifold on my 1998 v8 disco, can anyone help!!!!!!!

Hi all I am new to the forum and new to Landys!!! Just bought a 98 v8i disco with lpg conversion, lovely motor except for one problem so here goes, hope someone can help :) Every now and again (3 times in 100 miles) there is a loud bang that sounds like it is coming from the passenger side at...