A:- When its a narlofab TM stelth decat.
Had a pipe from chris155 that done away with cat+first silencer, his downpipe flange was 3hole mine 2hole, so had 2 cut flange off anyway.
had an old cat off a jap import, with same 2hole flange + bit of exhaust with another 2hole flange, cut this flange off opened hole out so decat pipe fitts through.
got cat smashed guts out of it , 1 empty cat.
bolted spare flange 2 cat eaven smeared joining paste on makeup 2 make it convincing.
slid decat pipe through 2 end. got Jason77's favorit tool out(mig welder) tack welded back flange making sure everything square, tacked frount flange this had quite a wide weld cat flange being slightly larger diameter.welded up
refitted 2 car what a difference if this is only 3-5bhp the're big big horses + sounds magic with supersprint backbox. look under car moggie's still there