that should be about right.. so that will tell you what performace you can see from those mods. Also a fuel controller would make those HP numbers go up. B/c the JWT ecu runs really rich. lean that sucker back a little and put alot more power down. With 2.5" exhuast i would day about 330ish and with 3" about 345ish with the JWT. Go a fuelcontroller.. add about 20-35rwhp. My brothers picked up like 27rwhp with proper fuel tunning. But you need to go to a wide band o2 dyno. good luck with your uprages. Also if any of these numbers seem funny fix them but these numbers are from personal experiance...