Is it one of them adapters from horsepowerinabox cause those things are quite well made and are tapered in/out so would help a lot in directing the airflow into the turbo better There would be an effect on power up higher I'd imagine when you need more airflow.
got ripped off a manifold (fkn knt sent me pieces and worse was it wasnt even enough to weld a manifold) and have nothing now but was offered a cast iron t2 flanged manifold for a decent price.
so was just wondering as i dont have enough money to buy a new manifold anymore