What are you going to use for tuning? How much boost do you want to run? I wouldn't suggest using the 3L intake manifolds if you plan on running large amounts of boost. Also what about the heat issues? I'm sure two turbos especially in such a tight confined space close to the engine will generate way more heat than a single turbo setup. And from what I understand even the single turbo setps temps need to be constantly watched.
I hate sounding so negative, but if you can't even address the issues associated with a simple 3liter swap, how are you gonna do with the complications of forced induction? What kind of experience do you have with custom fabrication to such a high degree? And why post if you know the reaction is gonna be negative until you've actually finished the project? My experience has always been that the people who want something done, don't do a lot of talking/posting about it, they simply go out and do it. I suggest that focus on getting more knowledge about 3 liter swaps and your platform in general. Than weigh the positives versus negatives of a twin turbo setup. I mean seriously why? :shrug: People make great numbers with one turbo and then have traction problems anyways. Don't aim to make a name for yourself on here by doing something so complicated just focus on making your car enjoyable for yourself. The last thing you want to do is waste time and money doing something that you don't enjoy. Just my .02, good luck!:laugh: