i originally had my car dynoed a moth ago and it put down 236hp and 280ftlbs stock with the only alteration being a removed silencer. i put on a flowmaster a/t catback and mrt catted h pipe 2 weeks ago and went and had it dynoed last friday and put down 244hp and 289ft lbs. gain of 8hp and 9 ft lbs at peaks, up to 12 under the curve. heres my question, how much woud a/f ratio affect power, i was expecting a little more that 8 hp from an h pipe and catback. i didnt get a a/f on either dyno so i have nothing to compare, but how much of a power difference would there be from going from an af ratio of say 13:1 to 12:1? secondly i lost some gas mileage after the install, probably about 20 miles to a full tank with the same driving, how long would it take the comp to relearn the correct a/f or will it ever? do you guys think that the higher flow of this combination could richen it up that much?