Originally Posted by zetaboostboy522bhp

Top boss performance had a custom inlet made by a Derby firm called swift engineering , they made the plenum and it had jenvey inlet plates and air horns built into the plenum box.
Loads of people also say avoid top boss as well so design something yourself.

all this was on a twin turbo setup and I think his blue sierra made 520 bhp but it shit itself on the dyno run.
my 2.0 litre zetec made more than that lol.

cheers paul