KalecoAuto's Flux Capacitor (U$ 175.000)
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Let me tell you an insider trick: you can buy the Flux Capacitor, keep it for years and then use it to return it in time to get a full refund!
You can check here their other conversion kits. Some are really useful, like the O-pipe, that delivers 100% back-pressure to any engine... amazing guys.
Finally, if your engine is suffering from reduced cylinder bore, you can check their Kuhneutson valves: they are a bargain at U$65.99. I won't mention any other products because Tomba might think I am a seller for them...