How to make an exhaust manifold in your shed! DIY

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 litre. Set up by: (HT racing) These three unknowingly helped with research: David Vizard Superb Mandrel bends off ebay from ebay seller: tube-fabs (middlesex)

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