I have 4 stock manifolds and 4 risers from my 454 mag mpi's.
had less than 200hrs on look like new.
$400 for a set for motor. (thats 2 manifols and 2 risers)
was on my Formula 312 fastech.
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why did u change them?

I had a complete set of EMI offshores and s/s risers from my other boat I put on with teague 450 switched exhaust.

Did you notice any speed change from the stock to the EMI ?