karimmoto98

Hello guys just a question that is really Troubling me I own a 2005 E55Amg the car has full exhaust with long tube headers and all the cooling system is upgraded to the highest level so no heating problems for the engine nor the supercharger air in addition both of the fuel pumps are changed with brand new OEM ones,IAT is good,SC boost is reading 11.3 psi while driving full pedal the car pulls hard from the start line after shifting it feels like a 2.0 engine no feel for the real power that it was making,so what do you think guys is the problem?