The Myth: Back Pressure
This is our third myth, write that down as we will get into far more detail for each one in the coming weeks.
Back pressure is needed or the car won’t run…. We’ve all heard that from one person or anther whilst hacking parts of our exhaust off. Well this one is one like we mentioned before that comes from our fore fathers set so well in their ways they won’t have any part of learning anything new. Now our fore fathers were great and got us where we are now running huge boost and horsepower they couldn’t dream of…. So what is back pressure? Back Pressure is the pressure the exhaust creates in the system while the car is running. If you have no exhaust system you would have zero back pressure because the exhaust escapes into open area. So what does it do, well nothing really, other than help push some extra gasses back into the air intake. It isn’t needed for the car to run, think about it drag cars have almost zero back pressure.
So how does lowering the back pressure help me out? Well the lower the back pressure the more freely the exhaust will flow out of the car allowing more fresh fuel and air to fit into the cylinders, meaning more horsepower and torque. The best way to achieve this on your street car is purchase high flow catalytic converters as cats are the most restrictive parts of the exhaust system. Next up grade the pipe it self to a larger diameter, but not to big on a Naturally Aspirated engine or you could lose torque. And finally a higher flow muffler.
Now the most important part is checking local laws to see what you can and can’t use without getting picked up on any charges.
Remember we will be getting into full detail on exhaust soon. If you have any questions please let us know.