Installed this the other night... aFe Stage 2 Magnum Force DCI.
Sound is awesome - It's like having Darth Vader under the bonnet. You can definitely hear the turbos spooling...
Very different from the BMS Intake I had on the N55 which sounded more like a BOV...
I don't know if it makes any extra power - aFe claim 27hp and 46nm, which seems frankly ludicrous but the throttle
does seem more responsive than before...