Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

MOPAROFFICIAL said

Is this thing at the moment running open headers? If so your tuning is going to change drastically once you get some back pressure involved. The idle speed, for one, will increase in rpm.
It won't need as much fuel either

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It is not, currently has the stock y pipe into 2.5 inch, flowmaster super 40, then 2.5 back. Basically the stock exhaust just with a flowmaster. I am on Monday getting a true dual with magnaflow 5” rounds with 2.5 inch all the way back if that makes a difference but I’m not sure it really will.

I bumped up the timing slightly and now it has a slight cut out when I blip the throttle again sounding like the engine completely cuts, but it also feels like it has a flat spot when I accelerate.

It’s also still dieseling which is a problem that seems to come and go. Right now I’m running 93 octane and idle is set to 750, vacuum is 20 inches.