How to make an exhaust manifold in your shed! DIY

How to make an exhaust manifold in your shed! DIY
  petrolhead1977
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This is how I did it, dyno video at the end. After this I built the exhaust to match and completed some port matching to get 157bhp and 137lbft torque which broke the magic 80lbft per litre mark on an accurate dyno. A Lamborgini Aventador has 79lbft per

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