ok so i been told tat a stock itr axle back would bolt rite up to a stock ls pipe is this true? i been asking this for a bit now and everyones response is tat it would fit so my question is since a itr axle back is 2.25 and a stock ls pipe is 2' is there any welding involve? does the flange or something line up? will there b any gap or leak? wat gasket would i have to use? really need to know thanks