I am going to put ss headers and mufflers on my 03 C4S are they really going to help that much , I no it should breath better , plus at the same time I will install the K&N 63 cold air intake system anyone with any ideas is welcome to reply

 

I would highly recommend against the K&N system, it will cause check engine lights and blown mafs. I have pulled numerous units out of cars because of this.

As far as headers and mufflers go, you will gain a little with the headers, but don't expect much of a hp gain with the mufflers, that is mostly a sound modification.

 

Hi
Have a look at the Fab Speed Cold Air Intake System. Whateveryou do, do not go for an Oiled Filter Bed, keep to the Porsche OE dry Filter. As the Doc says oiled filters tend to contaminate the "wires" on the Air Mass Flow Sensor (MAFS), which then flags up Warning Lights.
I've found that fitting Flowed Headers, 100 Cell Cats and Sports Exhaust Mufflers (I fitted a complete SuperSprint System) did give good improvements in conjunction with the Fab Speed Full Flow Intake system, but with the addition of the Revo Techniks Switchable ECU Upgrade.
Thanks and Regards Big Bob

 

Thanks guy's your input is most helpfull