i had headers, i compered them with the design welds etc of those that xforce make, i had them installed, drove in the car.. and gains= minimal if any. had my car tuned, and there was still no diffrence.
Maybe I should have fit an aftermarket exhaust to it at the same time.. but then who was to say the exhaust didnt improve my power ?

So technically the headers were not xforce, but were the same, OBX---Xforce headers. same thing.
-Chnage the collector like many say and you may win with power on the xforce, as to headers on the lude,...its something i dont want to be doing again