Supposedly a larger 'big bore' N54 TB is coming to the market but I bet the gains are not worth the cost. I also don't trust the company supposedly making it.
https://shop.hyper-racing.net/produc...e-body-upgrade
A whole 4mm larger!
What they should do is a full 100MM TB for the N54 and the manifold to go with it. Not that we can fit 100MM/4'' charge piping