mufflers or no mufflers??

Silent;

First up, welcome aboard.

Next up, would you list the mild upgrades? The reason is, mild has so many levels. Other than that, from reading what you wrote, I'm puzzled. An open exhaust will make max power, but a 2-1/2 pipe should be good for a decently powered engine. A loss in power due to your system should be small unless your engine is a monster 500+ mill.

I don't understand where this loss is so bad.