maybe reducing back pressure allows the turbo to overspin and boost excessively momentarily, but I doubt JUST a tailbox would cause that, a de-cat and a total system more likely too
No nothing.
No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.
No tackiness.
Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.
Innit?