Has anyone installed Flowmaster's Axle-Back system and noticed a power loss when cruising in the 40 - 60 mph range?

I had mine installed and a couple days later I started to notice a loss in power and torque unless the motor is under alot of load before reaching the 40-60mph range. I wonder if this is due to loss of backpressure...

 

I have them and didn't notice anything (except my wife complaining about it being loud)!

 

Running the FlowMaster 40's in my car, and it feels the same? Bit of a resonance at low RPM, but otherwise no problems

 

Personally, I don't think you can actually "feel" any loss in torque from installing a new muffler. I think what happens is that since the car is now louder, you expect it to be pulling a little harder, but it's still the same engine you had before. It's all in your head, IMO.

 

Is your car a stick or auto? that would make a difference because thats a major factor that the computer computes.....

 

This was a change that was HIGHLY noticed like night and day..not in my head...this is for sure

 

you must have done it wrong then...

but really, it's gotta be something else

 

what could i have done wrong? There is nothing back there that could be at risk of damaging while swaping the mufflers...