Hey guys

Ive got a turbo d16, currently running open downpipe, emissions time is coming up and I need to go so im making an exhaust from scratch.

Currently I have pretty much all of my exhaust made of 2" pipe with some flew sections and a cherry bomb turbo oem style muffler and a cherry bomb resonator (both were close to free)

Now I need a catalytic conveter

Im going to have a 3" electric cutout exhaust and that will be closed at the time of the test but I need a cat, I was planning on getting an oem, but I thought that might be a huge power loss when driving around with the cutout closed.

Should I go with an oem catco replacment or should i go ahead and can a cheap high flow one off of ebay?

Will a used cat work ok?

Thanks for any info