100rwkw is achieveable from an NA tune of the engine, where no engineers certificate is required, no costly turbo setup and plumbing involved, not to mention you'd prob want to EFI it (why bother turboing a carby setup, if you're gonna spend a couple grand might as well do the EFI mod too for better results).
People racing the Escorts were getting 220hp from the SOHC Pintos N/A (Darren Best who now races the ST170 in the Production Cars used to race Escorts and was telling me this), so getting 130hp at the treads is possible without resorting to boost, but a boosted engine will be more comfortable at 100rwkw than an N/A one. That power figure is nothing to a boosted engine, it wouldn't be working hard at all.
Tim
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