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The '89-'92 plenum has no triangular IAC port located between the throttle bores, which makes it easy to identify. A factory TPI plenum may not be a race piece, but with a little porting to match the larger runners, these plenums work well.
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 The '89-'92 plenum has no triangular IAC port located between the throttle bores, which makes it easy to identify. A factory TPI plenum may not be a race piece, but with a little porting to match the larger runners, these plenums work well.  View Related Article

 

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