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Message: <blockquote data-quote="TrickVert" data-source="post: 1484823" data-attributes="member: 8315">The stock cats actually flow well*, so unless your cats are cooked, that's not likely your problem.  I agree that there's something else going on.  My HCI 302 with GT40P's made 272 RWHP and 302 lb-ft TQ before the Vortech was installed.*From <a href="https://www.dfwstangs.net/threads/5-0-boltons-dyno-results.25409/" target="_blank">THIS FORUM ARTICLE</a> - Super Ford, May 1996:"Before proceeding with our exhaust modifications, we wanted to try a set of off-raod pipes with the stock headers and mufflers. Off-road pipes, which bolt in place of the factory catalytic converters, are not street legal, but many 5.0 Mustang owners bolt them on for the drag strip or road course. So after our Phase 1 bolt-ons and before discarding the stock headers and mufflers for Phase 2, we slipped in a set of off-road pipes from Pacesetter. We immediately noticed a more high-performance growl from the stock mufflers. On the Dynojet, the off-road pipes picked up 5.5 horsepower."</blockquote>