Anyone have any feedback or recommendations on replacing the stock air flow system with a PowerFlow kit, evo, or Maxflow air box enhancement kit or any other I may have missed. Is there a noticeable difference in performance? Do they actually increase the HP like they claim? Are they easy to install? worth the money? Some are quite expensive. I currently have a stock 996 with a BMC air filter.

Thanks in Advance.

 

No measurable improvement in performance over OEM.

 

What is you take on this??

 

Well, my own personal experience is that the BMC filter and removing the internal screens does as much as any of these kits. I tried one kit that had the metal tube and cone filter but I had a terrible flat spot between 4500 and 5500 RPM -- not good. I tried several things and finally sent it back. YMMV

 

yeah I agree. However the main area to gain other than the bmc would be to remove that airbox silencer! When you physically remove it, it increases a lot of airspace.

 

Just be careful, people have reported check engine lights and MAF sensor failures after replacing air boxes in the past...