Custom tune needed for minor exhaust upgrade?
 

I have the Edge Evo now and plan on buying a couple custom tunes in the very short term future. My question is, I have also thought about upgrading the exhaust a bit and wondered if I should wait to do the custom tune until after the exhaust work. The most I would do is a SI/SO exhaust from MBRP or Magnaflow but I have also thought about just swapping the stock muffler for something that has a bit of rumble. Any and all input is greatly appreciated.

I tow 5000 lbs. almost every weekend in the spring/summer/fall. I also know that with my CAI that I am probably running pretty lean right now so I want to remedy that asap too.

2004 F-150 SCREW 5.4 4x4 Lariat 72K Black
Edge Evo
275/70/18 Michelin LTX A/T2
K&N CAI 57-2556 - (plan to sell and go back to Gotts mod)
E-Fan from Mark 8, FAL controller 31165-VSC
2" front leveling lift
2x10" Fosgate subs under back seat
2x amps behind rear seat
6x8's in all doors

If you are not changing anything from the "y" forward you don't need an adjustment so go ahead and order.

As far as I know, any exhaust modification besides a true dual exhaust won't need any modifications to your tunes.

Most hi-flow cats need it as well as long tube headers and some short tube headers. Has to do with the flow rate dynamics.

I forgot to say mods after the cats...., lol oops.

Thanks so much for the advice. I got my tunes ordered!