eBay cat back

I purchased an eBay turbo cat back from mirage power. It says turbo cat back exhaust. The piping is 3" with 4" tip. 2.5" inlet. It mentions direct bolt on. It is except one part. The holes on the inlet for the cats bolts to go on are to small. The bolts from the cat are too large. I had to drill out the holes on the inlet. Didn't take much. Fit perfect after that and sounds really good. Very deep tone and that is with stock down pipe and cat. I just got a igh flow cat and 3" down pipe. Will update after I install to let you know what it sounds like. Might be a few days. I'm rebuilding the head.