i got one hooked up to the cam breather with a mini k&n on the catch tank
was thinking about dumping the mini k&n and routing it back onto the air pipe connector
i think they worth having as the air pipe and tb get well oily, just take off your throttle body and looked underneath the butterfly to see oil and carbon stuck everywhere
best thing you can do is give the engine cold clean air and remove the egr pipe, the inlet manifold is always full of crap from the breather
i recommend em