Hi everyone I talked to a flowmaster tech. yesterday and I was asking about a high flow cat. What he said surprised me, he said our factory cats are high flow. And if their not bad ,pie throwing a cel code, its a waste of money to replace them. I don't want my subie sounding like a (fast and fury ricer), so he recommended a flowmaster 12414310 muffler for a nice deep subie rumble. He said Id see 10-40% increase in flow with this muffler over oem. He also said to start off by leaving the rear resonator on , then if i want it louder, I could take it out later and not affect my engine management system. Or set CELls.
Any thoughts on this?