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I think your only true option right now is the twin-screw roots-type supercharger, since the space under the hood is a tight fit and a centripetal supercharger might not have room in there, even if there is one designed for the Echo. I'm sure you can find a TRD one here or ebay or from TRD themselves, although I'm sure it's very pricey. Otherwise check Toyota TTE (Toyota Team Europe) as they have that same supercharger in their Yaris T-Sport (same as the 1.5L EchoHatch RS), or check out Blitz website as the supercharger came from them. Good luck.
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