RESURRECTION:
My first 1986 22RE automatic longbed....
I had a speed shop install a Doug Thorely Tri-Y header.
The speed shop installed new pipe - 2.5" and a free-flow muffler.
The drop in torque was very very noticeable, especially from off-idle through 3500 RPMs.
I had to have new 2" pipe and a different more "restrictive" quieter muffler installed.
Apparently the 22RE and Mamma ECU is sensitive to some backpressure and exhaust velocity and too big of pipe = serious reduction in power.
This may be debated and argued, however, it has been pretty much determined to be true for a factory stock 22RE.
Gnarls.
