i think the smallest i have seen come on stock cars like vw.
i would be careful cause even small tubos can put out alot for a single piston engine and if the engine is sitting next to you and you blow it, it might be dangerous.
i know at www.theoldone.com on the forums there's a guy who use to work with cart race engines and is very knowable he would be able to help with advice.
Look under ask T.O.O
hope it helps.
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