At the cheaper end of the scale I put a Bugpack header and Turbotrip on a 1600tp with twin hotspot. It was modified by adding the 20mm pipes from the two free ends of the twin hotspot pipe down to the collector ensuring that they connected to the appropriate pipe for scavenging. It really works, the mainifold warms up very quickly and strangely I have retained the beetle 'whistle' with a deep throaty exhaust note. I like the beetle whistle as I think its iconic of the smaller engines.
Clive
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