What benefit do you think you will get from going to plastic? It gets just as hot as the aluminum one does. The plastic one is set up for the +98 PCMs which have a faster processor and this throws the whole table out of whack with you '97 PCM tables. I tried it once and it ran so lean I didn't even want to try. It's one thing to do minor changes in part of the MAF table but to completely modify the entire table takes a lot of time and tune modifications.