So, I'm doing a stage 1, Rush 4" "Big Louies", with 2.5 inch baffles, and aftermarket A/C. I have read a ton of stuff about how this will lean out the air fuel mixture and could lead to ride-ability issues. I have read about the Xied in line enrichment devices from night rider performance as well as the Dobeck EJK tuners, to compensate for the added air flow. I contacted the folks at Dragos to get an expert opinion from a reputable engine builder and was told that nothing is needed for a stage 1 such as mine, that the stock ECM would compensate adequately and that any fuel enrichment device would only result in additional fuel use, lower mileage and increased catalytic converter heat. This sounded counter-intuitive from everything I've read on this forum, so I thought I'd throw it out there; Anybody care to comment with their experiences. BTW, I'm really leaning towards the Dobeck EJK as I'm not looking to do any further engine mods for at least 5 more years. Their website has some really good links to information of the effects to catalytic converters due to fuel/air mixture changes.