i have a 4" cowl. right NOW i have the ram air off a TPI. (i have TBI). right now it seems like its flowing fine, but i am about to do heads/cam swap. with the cowl, should i go with the open element b/c of the cowl letting hot air out, or should i keep my current setup because the gain i get will be negligible in light of the fact thatwater can get into my filter?