I got an 03 tib with Cai, obx 4-2-1 headers, and the sfr cat back exhaust. But when I installed my headers I had to delete the cat. That's when it got super loud, so I put a glass pack to tone it down a bit but its still some what loud. I also lost a lot of my bottom end when racing, so basically I just want to know what's the best hi flow cat for the I4
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