Dual mufflers w/o customs

[4.6 Punisher]

Originally Posted by Yogi

I have a 2005 F150 FX4 5.4L with a K&N air intake (I know about the lean issue ). I am ordering my Gryphon right now and will be getting the custom tunes once I get my HEX.
I also want to get my exhaust redone and will be getting true duals, either bullets or Magnapacks. Would it be ok to have them installed before my tunes are ready or should I wait until after I get the tunes?
Also on the Gryphon order form should I put my current exhaust setup or the future setup?

Good choice on the mufflers!

I would go ahead and get the exhaust done. As long as you don't mess with the O2's or remove the cats, then you're good.

On a side note, high flow cats with Magnapacks sound down right godly!