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<blockquote data-quote="Silver 03 Cobra" data-source="post: 186225" data-attributes="member: 3137"><p>Don't waste your money on FMS headers. There are documented gains of 2-3 HP. My buddy and I just dynoed our 03's after we both added 2.80 pulleys.</p><p></p><p>He has BBK LT's, BBK o/r h-pipe, Flowmaster catback, Johnny Lightning CAI, Diablo chip, 2.80 pulley, colder plugs. He made 480 rwhp and 502 rwt.</p><p></p><p>I have JBA 1 5/8th headers, Bassani o/r h-pipe, Bassani catback, 9 in conical filter, JDM Flipchip, 2.80 pulley colder plugs and I made 479 rwhp and 479 rwt. I was happy with the HP but my buddy has me on torque.</p><p></p><p>My buddy was very lean on top and I actually fattened up over my 2.93 pulley. I was running 11.1 at 6k rpm. I think I could gain a little with a program change. I also think they may have forgotten to put a fan on my engine when I dynoed which would have cost me some power and maybe fattened me up.</p><p></p><p>I think the headers are real close as long as you don't get FMS.</p></blockquote><p></p>
[QUOTE="Silver 03 Cobra, post: 186225, member: 3137"] Don't waste your money on FMS headers. There are documented gains of 2-3 HP. My buddy and I just dynoed our 03's after we both added 2.80 pulleys. He has BBK LT's, BBK o/r h-pipe, Flowmaster catback, Johnny Lightning CAI, Diablo chip, 2.80 pulley, colder plugs. He made 480 rwhp and 502 rwt. I have JBA 1 5/8th headers, Bassani o/r h-pipe, Bassani catback, 9 in conical filter, JDM Flipchip, 2.80 pulley colder plugs and I made 479 rwhp and 479 rwt. I was happy with the HP but my buddy has me on torque. My buddy was very lean on top and I actually fattened up over my 2.93 pulley. I was running 11.1 at 6k rpm. I think I could gain a little with a program change. I also think they may have forgotten to put a fan on my engine when I dynoed which would have cost me some power and maybe fattened me up. I think the headers are real close as long as you don't get FMS. [/QUOTE]
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