Mopar Action June 09 issue Did a flow rate shoot out on Stock Magnum, MP Aluminum Magnum, MP Iron R/T, MP Ed Alluminum and something called Engine Quest Cast Iron. You should buy this mag and look at it. They do verious lift intake and exhaust. The Engine Quest was was a good as the ed head alum. They didn't give a price on the head but said "... usually though of as simply low-cost ... bolt-on stock replacement heads... so we almost discounted them, figuring that they must be some Chinese junk. ... they were the overal intake flow winner, and, except for the junkyard, the lowest priced heads of all."