Headers

What mid pipe are you going to run? You will need a retune or will get a check engine light if you plan on running an O/R pipe; Also the retune will change the o2 sensor data for the heater circuits, since the pre cat o2s will be farther from the engine they will take longer to reach temp and may cause heater o2 heater circuit codes. You will also need a pair of o2 sensor extenders for the pre-cat o2s. You will need to loosen the motor mounts so that you can gain room for the headers, also you will need to take the starter loose. I also recommend removing the battery.

What other mods to you have? Manual or Automatic?

has any one heard anything about this header and h pipe? its only $520 for the kit for everything you need thinking about going with this but want some feedback on it it is RPMs product here is a link

Moto STEEL Polished Stainless Steel Headers and H-Pipe for your 2005-09 Ford Mustang GT 4.6L 3V