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Performance Exhausts


Performance Exhausts

Our Performance exhausts are designed to increase engine power and improve the look and sound compared with o/e.  Your cars exhaust system is basically there to allow the combustion gases to be released into the atmosphere.  These gases are produced when an engine burns fuel during its combustion cycle.  The cylinder head is usually on top of the engine and has exhaust ports (holes) from where the gases escape.  These gases are collected by an exhaust manifold (known as the header in USA) which is bolted to the cylinder head.  On UK cars built after 1992 the exhaust system is fitted with a catalytic converter (cat) which cleans gases as they pass over its internal cells.  Once they have passed through the cat they are forced out into the system.  An exhaust system is basically nothing more than pipe work with silencers fitted to reduce the noise produced. Each big bore exhaust for sale strives to improve performance.
With performance exhausts pipe diameter bigger is not always better. While modest increases in pipe diameter can be beneficial large increases can in fact decrease performance, in particular low RPM torque. As a rough guide pipe diameter can be increased over standard by 10%-15%. In many cases aftermarket exhaust brands find gains with their exhaust kits by replacing restrictive standard baffled silencers with straight through sports exhaust silencers with pipework to make a big bore exhaust back box. Straight through exhaust system parts designs donít necessarily have to be too loud as they use acoustic padding around a central perforated tube to absorb noise in the central and performance back box exhaust.
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Performance Exhaust Manifold

Car manufacturer's main requirements of their manifolds are to perform the tasks of gas expulsion, last a vehicles life, be quiet when in use and be as cheap as possible to produce.  Most standard exhaust manifolds are made from cast iron bolted to steel down pipes or directly to your cat.  With performance exhausts the manifold is designed to allow an engine to produce as much power as possible and is usually made from mandrel bent steel tubing.  A performance manifold design allows gases to escape more quickly with a quicker reving engine.   Ideally a separate tubular pipe is bolted to each exhaust port and sealed with a gasket.  There are some exceptions to this rule where a car engine has siamised exhaust ports such as the Ford Capri 2.8i (ask your dad) this means two cylinders share one port.  Another phrase used to describe this product is 4 branch manifolds which is accurate for most cars with a four cylinder engine.  If your car has a six cylinder engine then you need a six branch manifold for a straight six, or two three branch manifolds for a V6.  In most applications branches or tubular pipes are swaged together or meet in a collector box before joining the rest of the exhaust system.  In theory it is ideal to have equal lengths for each tubular pipe.  In practice the pipe lengths are tuned to avoid unwanted pressures and allow manifold gases to exit as quickly as possible.  Space or lack of it under bonnet also determines manifold design and shape.  On some engines exiting gases help pull fuel / air mixture in to a combustion chamber to be ignited.  Additional benefits of fitting performance manifolds over standard are a more pleasing engine sound, lighter manifold weight and great under bonnet looks.  Itís not unusual on high performance cars to find a manifold wrapped in a heat absorbing covering to reduce under bonnet heat.

Sports Cat

The Sport cat is a replacement catalytic converter that is designed to allow exhausts gases to pass through quickly while still being cleaned as they go through.  Performance is improved as there is less restriction with fewer internal cells for the gases to negotiate as they exit.  Sports cats will pass an MOT emissions.

Decat Pipe

Decat Pipes are basically an exhaust box or pipe the same dimensions as a cars catalytic converter.  These are bolted in the same place and allow more power by being less restrictive than the cat.  As they have no internal cells to clean the exhausts gas they will not pass an MOT emissions test.  They are popular with customers who take their cars to track days or for fast road driving.

Race Tubes

A race tube is another performance part popular with track day enthusiasts.  The race tube is a performance centre section of an exhaust system built without the usual restrictive central silencer or silencers.  This is less restrictive and allows the exhausts gases to exit more quickly this also produces more noise than a silenced centre section. Race tubes are also refered to as non resonated centre section by some of our suppliers

Performance Exhaust System

When we supply a performance exhaust system it is designed to look and sound great but most importantly produce more power. Our Performance exhaust systems usually comprise of a centre section with silencer and a back box, they are bolted or clamped to the front pipe, manifold or cat.  Race tube systems are the same as the performance system but with fewer silencers for maximum power and are louder than standard exhausts or the equivalent performance exhaust system. Benefits of performance and race tube exhaust systems include a sharper throttle response; deeper bass sports exhaust sound, power increase and great looks from the choice of tail pipe designs. Performance exhaust systems are designed to allow gases to exit as quickly as possible from engine to rear of car.  This is done using combinations of larger bore pipe work, free flow silencers and pipe work with more efficient bends than standard.  Most performance exhaust systems follow a similar route under the car as a standard system.  Some manufacturers offer systems that follow a different route to allow better shaped bends, central exit tail pipes or dual exit tailpipes.

 

Performance Back Box

The performance back box is one of the first steps tuners take when modifying their car.  The back box is also called the rear silencer and is the final part of the exhaust system.  Although only small performance gains are achievable by fitting a performance back box to your car you do get good looks from the tailpipe designs and a louder deeper bass note.  Fitting a back box is also a fairly easy DIY job as they are made to use original mounting points, rubbers and clamps.

Summary

Performance exhausts offer noticeable power gains over the standard item being less restrictive and producing more power and torque.  This is achieved with well designed exhaust manifolds and sports silencers combined with free flowing pipe work constructed to exit combustion gases quickly.  Many modern car exhausts are built down to a price.  The performance exhaust designer uses the best materials available in his product such as aluminised steel, stainless steel or titanium.  These products are often backed up with lifetime guarantees and can work out better value than the standard item in the long run.  Additional benefits gained are a sporting exhaust sound and good looks with a choice of tailpipe

Rear silencers - Simply replace the original back box for great looks, sporting exhaust note, small power increase, easy DIY fit all at a good value price.

Exhaust systems - Usually from the cat back all the benefits of the rear silencer plus noticeable power gains you can feel when driving.

Exhaust manifolds - Replace the original manifold with high flow tubular exhaust manifolds for maximum power gain.  Cat replacement pipe or sports cats ideal for track days are available for most cars.

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