pipe size from collector to tail pipe.

31/2 inch from collector to X and into muffs....3 or 21/2 inch out over axel into tips,if you have the room....Had my 419 with 3 inch done in oshawa.Custom shop,Simcoe street south.I like the stock look.My tips are 21/2 inch.I welded from collectors to x and muffs with hangers,they only did from muffs to rear. Good luck and nice car too.Your a welder,make your own X or H .