One of my heat shield bolts snapped. I drilled it and tapped it. All good. I’ve run the die grinder round the inside of the manifolds to give it a better flow. The reason I’ve not gone for new manifolds is: if they crack its a complete shit to replace, and the HPI turbo elbows don’t have threads to fit the turbo supports, so the turbos will be hanging from the turbos so the manifolds need to be strong.
My engine build:
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