The SP2P wasn't even a decent MPG manifold. I'm sure it's one of those designs that Edelbrock would like to forget about. "Turd" is just the tip of the iceberg. Back in the 80's my local speed shop was having a sale on those manifolds so I bought one for a small block Chevy pickup. 3 days after installing it I put the factory intake back on. Not only did the performance drop with the SP2P, but I lost 5 MPG as well. It's a waste of good aluminum.