I ran Felpros with no problems on a 437. However, I promtbly blew 'em out on a 15 to 1 511 tunnel port. Consequently, I now run copper on a 511 and Cometics on a 542. I would not take a chance with Felpros on a 14 to 1 mtr..If they blow out, they'll ruin your heads and maybe the block. Better to be safe than sorry. Hope this helps. Good luck.
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