I would not go stock ported EX manifolds. Be just a waste of time I'm sure. There's a few others on here that Fab exhaust manifolds, they just don't like it being none and I respect that wish. So I'm good on that end with a good price, even Greg's price is very good. The Pentroof's is way out from the cost of others ( as we know ) and at $1000 ea. that's hard to swallow, lol. It's like buying import parts for our cars ( high dollar ) and buying Domestic parts ( cheap but not always cheaply made ). :)