Having had this mod for a few days now I must say I am very impressed. The cat pulls a lot harder from take off now and it has also reduced my fuel usage. According to my read out I reckon I am down by about 1 litre per 100 km, not a lot but still worthwhile, I know, I know the read out is not reliable but still.
On the eastern
distributor the other day I was under 7.0/100km.
Strangely it has also affected my exhaust note it is not as loud as what it was. The only bad thing about having a "louder" exhaust is that the engine "growl" gets lost in the racket coming from the back end.
Haven't had a chance yet to give it the "wide open" treatment yet but will soon.
Certainly now when you give it throttle you can hear a sharp intake of air as it sucks it into the filter. The small filter is for the O2 sensor. On my pod filter this was inserted through a hole in the bottom of the filter but this set up is different the sensor has it's own "baby" filter now.