I'm looking for the stock exhaust size for my 87 r10 5.7L. Its getting pretty bad, so I'm going to replace it. I'm going to use this high flow cat (is it actually a high flow??) off of amazon. But for some reason, I was thinking the stock exhaust was 3" and not 2.5". Since its a single exhaust. Anyone see any reason I shouldn't buy this?
Amazon.com: Magnaflow 94006 Universal Catalytic...