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The suck bang blow


BLOW: The exhausting stuff

Blow - getting rid of the exhaust fumes is important and the less pressure there is in the exhaust system the higher the BHP. Polishing the inside of the exhaust will aid the fast exit of gases .

My 3inch flowed exhaust

A larger diameter exhaust means that as the pressure needed to expel the air is lower the whole process will be quicker with a lower push needed. Cats suck power by slowing up the airflow but are sadly a requirement on today's cars – typical reduction of 4 bhp overall so if you find a high flow sports cat or use an off road only de cat pipe you will notice an improvement.

The shape of the exhaust manifold (painted red in picture) is also critical as is the primary and secondary length and this is something best left to the experts to calculate – most manufacturers do a reasonable job but to improve a standard one smooth out the inside with a grinding wheel on a drill or buy a purpose built stainless steel unit for your car

. Most sports silencers add a deep roar to the exhaust but this adds little to the overall experience. One of the best exhaust I ever had was a standard one with the rear silencer remover – the centre expansion section was larger to help muffle the sound but it really improved things a lot.

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How to maximise combustion

How to increase the exhaust rate
The importance of oil

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