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I have a Flowmaster Deltaflow 40series behind it.
I haven't ever had the truck on the dyno... I don't see the need... all I am so far is bolt-ons anyways...figure with everything I added 20hp and thats pushing it. Maybe after I figure where I want to go with motor(s/c, nitrous,h/c???) I will try to put some numbers down.
I also have the Dynatech system, and I also have had the same 157 Sensor 2 Band 2 low voltage code - I cannot remember who I talked to about this, might have been either Dynatech or someone online.....but the rear o2 sensors are to tell you if the stock cats have gone bad. They are useless for aftermarket/high flow cats. Seeing that the same sensor in our trucks has gone bad, perhaps it is just that side that gets more 'free flowing exhaust' from the passenger side header which causes the code (just a guess)
I had allen delete the rear o2's and never got the code again.
Sorry if this is already resolved or if this is an old post, this is one of my first posts on the board and I thought I'd reply because we had the same problem ;)