The BTB unit is a more expensive exhaust unit than the others on the market as they are much bigger, with a lot more stainless steel needed to make them, one benefit is however you do not need to buy a de cat pipe.

Having said all of the above about taking the exhaust cat out is not a perfect solution, it is still better to remove it, than leave it on. The reason the exhaust cat causes the back pressure problem is it does, is it's construction. As said before a good condition car does not need an exhaust cat, the reasons for the manufacturers fitting them is that if the car was out of tune and running rich, the gas would be very polluting and so the cat then comes into play. So for most of it's life it is doing nothing, except under cold start conditions. The way the exhaust cat works is that the gasses are forced through a honeycomb of small holes that are coated with special metals which form a chemical reaction to purify the gasses. It this forcing the gas through the small holes that creates the back pressure.

BTB System Shown In Comparison To Standard VTS System

Many people ask about the legality of removing exhaust cat, especially in regards to passing the M.O.T., all the law says is that the exhaust gas exiting the tail pipe must conform to a certain standard, any car that's in good condition and regularly serviced will pass the exhaust cat test, without one fitted, even cars that have been modified quite a lot usually still pass. For those that don't we can provide management to overcome these problems.

Go to page <1> <2> <3>