Exhaust X & H Pipes


Q. Do the Off Road H-pipes and X pipes have the EGR equipment and O2 sensor bungs like my stock pipes?

A. All of BBK's pipes have the same hookups as the stock exhaust pipes, so that you may simply bolt-up and go - however remember Off Road Pipes of any kind are strickly for Off Road Race Use Only and are Illegal on any highway

Q. Does the X-pipe really flow better than the H-pipe?

A. Yes it does! The X configuration greatly increases scavenging in the exhaust system. Instead of pressure being equalized by a smaller, more restrictive straight piece of pipe, the sides come together in a much more effective design. The X section is larger, and the pipes angle directly into it, meaning the airflow does not have to try and jump from one side to the other to equalize pressure; it is a much smoother transition, leading to better flow numbers than its H-pipe brethren. 

Q. I currently have a BBK H-pipe on my car. I want to switch to a BBK X -pipe. Will I need to modify anything to make it work?

A. No, that should not be necessary. Both pipes leave BBK ready to bolt in place of the stock exhaust pipes, meaning that they should be interchangeable.

Q. Will the X-pipe work with my Automatic transmission?

A. The standard-length X-pipes have more than enough clearance to accommodate the standard automatic transmission.

Q. After installing a BBK Off Road X-pipe on my vehicle, I am experiencing some resonation from my exhaust system. Is this normal, or is something loose?

A. More than likely there is nothing loose in your exhaust system. Off-road X-pipes have nothing that could really ever come loose inside. Also more than likely is that you are running a Flowmaster cat-back system. You see, Flowmasters make their famous exhaust note using the science of resonation, where sound waves are bounced back-and-forth, and then recombined with other sound waves to change the sound tone, pitch, and volume. We have noticed over the years that Flowmaster muffler systems when teamed up with our off road X-pipes, can work together to create an exhaust note that not every enthusiast will appreciate. However, there is nothing wrong with either system. Rather, when both are used together you might experience this phenomenon. BBK recommends a muffler system that is a direct-flow type, similar to a Magnaflow or perhaps a Dynomax, should the Flowmaster system not work for you.

Q. I seem to have clearance issues with m BBK X-pipe/H-pipe. Is the part wrong or is there a better way to do it?

A. BBK recommends that when installing exhaust pipes, you loosely install all the connections first. Then, you will have a little bit of play to "put" the pipe where it fits best, then tighten down the corners equally. You do not want to start at one corner and tighten down fully. This could possibly pull the pipes too tight to one direction, causing fitment problems at other connection ends.

Q. What size are my collectors?

A. With the exception of the primary runners, all of BBK's exhaust piping is 2 ½ inches. So all of our collectors as well as our H and X-pipes are listed as 2 ½ inches in diameter.

Q. I purchased a BBK X-pipe/H-pipe with High-Flow catalytic converters for my Mustang and I now have a check engine light?

A. This is a question that comes up quite often after installing our high flow X pipes with the steel substrate converters.

These converters are used because they are the best “High Flow” converters available for performance applications and also for the fact they are bullet proof – in fact we have never seen a set go bad and never warrantied any over 10 years.

The reason that you are getting codes or check engine lights is because the computer in the car is getting an irregular signal from the O2 sensors

Even If the code says they need replacing it is simply that the actual convertors are high flow.

This is fixable with a tune unless you ran over something and damaged them.


Q. I was thinking of purchasing a BBK H-pipe/X-pipe. Will I be able to retain the factory exhaust manifolds and muffler system?

A. Yes. The BBK Full-Length Mid-Pipes are designed as a direct bolt-on replacement to the factory H-pipe, so you CAN retain your factory manifolds and mufflers. This can be an important thing for many enthusiasts with new cars under warranty, as some dealerships will not warranty a new vehicle if the factory manifolds have been removed. Since BBK's pipes will allow you to keep them in place, you can get greater horsepower while possibly still staying in bounds of your warranty guidelines. And of course, we remind you that it is your responsibility to follow the manufacturers warranty guidelines!

Q. I purchased a BBK header/H-pipe/X-pipe system for my 5.0L mustang. Why won't my collectors line up with the rest of my exhaust piping?

A. The BBK exhaust pieces are designed around a factory head. In this way, we can ensure that it will fit a factory 5.0L, or any 5.0L with parts that also match factory spec. However, some after market heads DO NOT meet the specs of the factory heads. If the deck height is larger than stock, then it will push the collectors more toward the center, and cause misalignment with the H-pipe or X-pipe. A similar misalignment will occur if you are using a hi-port head, as it will bring the top of the header further up the slope of the head, changing the location of the collector relative to the rest of the car. The problem can seem even more severe when used with Long Tube header systems, as any angle change becomes more noticeable the further away the from the area of rotation. Basically, a small-degree rotation may affect the alignment of a short pipe by less than an inch, but since the collectors on the long tubes are much further removed from the source of the angle change, the difference could be as much as a few inches.

Q. I Getting A Check Engine Light And Codes after Installing Long Tube Headers & Mid Pipe - What Can I Do?

A.Check engine lights will occur on some vehicles with long tube headers and high flow or off road mid pipes due to the fact that the factory computer is measuring the temps for the converter and O2 sensor constantly. When a converter or O2 Sensor is re-located further back as it is with long tube exhaust headers a check engine light appears because it takes the new converter longer to heat up. It is Not a physical issue with the headers or cats or O2 sensors (codes people are getting) and not a physical drive ability problem. It can be eliminated with a vehicle tune.

Q. Correct Header gasket Installation?

A. The most important factor for leak-free header gaskets is the way that the header gasket is installed.

It is very important to follow the installation instructions when installing the gaskets.

 The steps to follow are:

 Install headers and gaskets and tighten bolts tight to correct torque

Run engine and allow the headers to get hot.

Shut the engine down.

While the headers are still hot tighten the header bolts again to correct torque.

Operate the vehicle for 200 to 300 miles.

While the headers are still hot tighten the bolts one more time to correct torque

 If this procedure is followed, the header bolts should remain tight and the gaskets should last for many years.

Checking the bolts once a while is also good idea - just make sure that everything remains tight and you don’t blow a header gasket.