Quote:
Originally Posted by jchammond
Cut it loose at the collectors & run open headers 
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It's the same exhaust I had on it when it made 680whp. They're thinking it's possible one or both of the 100 cell mil spec cats is fouled or something. I asked LJ at Specialty Z if they could do a dyno pass uncorked to rule out or verify that it's an exhaust restriction. He said he'd ask Seb.