i have a 05 f150 withe the 5.4 V8 i added a K&N intake and i have a Flowmaster DOS. It runs great above 3000rpms due to theintake but its getting up there were i have the power issue. I'm looking to improve my performance and gain some horse power in the lower rpms as well as get a little more out of the higher. what shoud i do?

 

Get a Gryphon or an Xcal3 tuner with custom tunes. You really need custom tunes with the CAI. The tuner will really help on the shifting and downshifts as well as get all your engine has to offer. You can get more low end torque by replacing the Flowmaster with a Magnaflow. They don't sound as good to me, but they do help the low end, if you are looking for performance.

 

no i like the sound of the flowmaster i would like to keep it. what about any warratys coming with a tunner. i know one of superrchips comes with a drive train wrranty. im leary of automatic trannnys.

 

are you talking about ford's factoy warrany? i've never heard of anybody offering a warranty on your drivetrain when the transmission could be the problem, not the tuner. i hope that makes sense.

 

Xcal3 with custom tunes from a place like VMP Tuning.

 

what do you think of the diablo predator

 

Get custom tunes, you won't regret it.

 

Get custom tunes from Bill at PHP.

 

x2.