<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by TheDuke &raquo;</td></tr><tr><td class="quote">250 EFI, the XB doesn't have the updraft intake, the 250 EFI has the intake like a 300X

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In other words, this is a Later Design 250 EFI, single-shutter throttle with down-draft intake plenum (and 555 or "triple-nickle" ECM).