Ray2d2

My friend had a similar situation with his 15 Tahoe. Got a GM Borla off of ebay from a salvage place, turns out it was for a 6.2 Yukon XL. Got a 3" flange installed and middle pipe shortened and everything else bolted up. Been running 2 months with no issues. Its not very loud unless you are on it but it sounds good. FWIW both systems muffler is dual 2.25" out. I didn't do a calculation but I would think the most restrictive component after adding either system would be the cats.