Originally posted by UR-2-SLO
get a dyno for a baseline, i just installed a 2.8" blower pulley steeda CAI, denso iridium plugs(1 heat range colder), and Diablosport predator with custom tune from www.need-4-speed.com and my car put down 431.9 hp and 438 ft/lb tq at the wheels. the dyno was done at FordSpeed.com which reads about 10-15hp less than the old SecretServices dyno.
pulley, Predator with custom tune, puller/installer for pulley, metco idler pulley, Denso Iridiums, and Steeda CAI ran me right at $1400. i also have the SLP stainless catback with all 4 stock cats installed.
next mod is wheels and tires for the dragstrip. then i will go headers and X-pipe.
BTW this is on an 04 cobra
you are putting down alot less than you should, even 440 is low for those mods, go to Coastal and have them look at your tune, something has got to be off.