With the new engine I want to do some upgrades to the exhaust, so I ordered a new cat. My old cat was a high flow cat, but only 1.875", so I have a new one that is 2.25". I also got a wideband o2 sensor and gauge to see how things look. My last muffler was a flowaster 50 series, and was 2" piped, I am looking to go quieter and 2.25 or 2.5". Haven't decided which muffler to go with yet, but am wondering if I could get a side exit in front of the rear fenders.