How To Install a Pypes Off-Road H-Pipe on your 2005-2010 GT Mustang

QTY           PART#              DESCRIPTION

1                HFM23              2.5” H-pipe (LH)

1                HFM23              2.5” H-pipe (RH)

1                HVC50              Clamp

1. Start by removing your old exhaust system.

Your original H pipe is connected at each manifold with studs and at the trans mount. Just past the ‘H‘, disconnect the factory band clamps and save them for the H-pipe installation. We recommend an ample dose of WD40 or other brand of penetrating oil to avoid stripping or breaking the bolts at the header flanges. Remember to disconnect your O2 sensor switches before dropping the factory H pipe.

2. Connect each side H pipe from the original exhaust to the manifolds and slide the RH balance tube into the LH balance tube. Do not fully tighten. Use a stand to keep the H in place. When you are satisfied with the height, tighten the studs at the manifolds first, then fasten using the clamp provided. Finally reinstall the OEM band clamps.

3. Re-connect your O2 sensors. Be careful not to twist the wires.

4. Start engine and listen and look for leaks. Black deposits at any junctions indicate an exhaust leak.

5. After driving the car for approximately 50 miles, check the system for any possible loose connections. 

The first time you warm up the exhaust system you will notice quite a bit of white smoke. This is normal! It is the Mandrel fluid used to bend the pipes that has not evaporated.

HFM23 does not have catalytic converters and is for off-road use only.

Your “Check Engine” light may come on after prolonged use. It will not effect the performance of your vehicle but can not be fixed by the dealer as removing the catalytic converters voids the warranty. As of this printing, MIL Eliminators are not yet available for this application. Most aftermarket tuners and chips can eliminate this ‘check engine’ light problem.

**rich conditions, unburnt fuel getting into the converters, or oil getiing into the converters can cause converter failure and is not covered under the warranty.