Stillen STILLEN Hi-Flow Catalytic Converters

[eric11111]

Are these worth installing in my car for some power. Part number 503436

I have the G35X 2008. Thanks

[RED_DET]

Horsepower gains minimal, sound increase and they aren't cheap. Not a bang for the buck mod in my book.

[tollboothwilley]

i think these have a much higher HP gain than people think...but they are expensive.

Get the Kinetix HFC's, or the BERK

[Sentientbydesign]

I found a dyno with Pop Charger and FI HFCs that showed a gain of 15 peak HP and 3 ft lbs of peak TQ

[tollboothwilley]

thats about what i'd expect it to be

add a catback system to that and it would be perfect.