So yeah instaled it today, the finish and look is awsome. It sounds great, BUT it seems as if its lost power, when you get down on it, it seems flat powered. I have a K&N CAI as well, the intake alone made considerable more power, but now with the exhaust it seems like its lost power. Anyone else have any experience or suggestions on this. Kinda aggrivated, this is not was I was hoping for.

 

That is odd. Have you tried resetting your ECM? What size is your truck's bed by the way?

 

How do I reset the ECM? Its an 06 5.4 with 5.5 bed.

 

Disconnect the battery for about an hour. Turn on headlights with battery disconnected, this will drain out any memory in the ECM. Then re-connect battery after an hour and it should re-map itself.

 

if someone could, explain what exactly happens to the ecm and it remapping itself to gain or get the hp back

 

thanks magna rep i will do that.

 

raptor man did that seem to do anything for you?

 

Yes it worked like a charm, runs awsome now.

 

When I got my Magnaflow 12158 installed, I watched while it was being installed and the guy installing it did not disconnect the battery. Do I need to do it to reset the ECM?

 

I never did it to mine.

 

It sure made a world of difference on mine as far as power and fuel milage. Before I did it it sucked the hell outta gas on the way to work and virtually no power at interstate speeds. came home from work the day after installing it, unplugged the battery for about an hour and it was like driving a different truck.

 

BTW sweet looking truck 05supercrew, love the all black look.