if i were to do a turbo upgrade would it be worth it to buy the atp manifold or would an eliminator on my stock manifold be just as efficient

 

In my opinion, a ported stock one is almost as good and it isn't worth it to me for 350 plus shipping. All I have is a stock ported and it is fine.

 

Go with stock ported. Cheap and sufficient IMO. I have both. Got the P&P stocker done for $100 from a local machine shop. I am currently running an ATP mani on my GTRS. I ceramic coated the piece before install. After 2 months of use the first runner closest to the radiator cracked. I now have to take it off and send it in to get replaced under warranty.