question guys,

I am looking to buy a free flowing cat for my sc300 and I currently have a 1jz w/a 3.75" single dp w/ apexi muffler from a supra tt,.

Should I purchase a cat for a sc300, supra or any other specific application? Any places online that offer a a good one?

 

you can just buy any free flow cat that has the right inlet/outlet diameters.