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well, you could go with a single turbo kit that replaced to stock twins with a bigger single turbo. im not sure about upgrade kits. i think if there was a upgrade kit for the stock twins it would come as a package that would include parts for both turbos. screw it...go single
You can get your turbo upgraded by sending in your unit in exhange for a rebuilt, blueprinted, and balanced turbo. They are the hybrid turbos at pettitracing.com. Single turbo kits are one big turbo, which replaces the stock twin turbo unit, and also uses a different exhaust manifold. Going single is badass but plan on spending thousands of bucks. Also, going single, you need to upgrade your fuel system. injectors, fuel pump, and upgraded ecu. Oh yea, forgot to mention the cheap method of going non seq.
Of course you can upgrade the stock twin turbo system, in fact that is what I want to do. As my FD is for the street and weekend racer, I don't want to go overboard and also keep the turbo lag 0. That is why I like the twin turbo system so much, alhough there are problems but this all depends on what you want to do with your car and chooses the correct setup for that purpose.
Don't know if the pettit turbos will get you any noticeable power gains without upgrading the compressor wheels - just porting won't cut it - might make them spool quicker. BNR has different stages where you can upgrade both turbos or his Stage 1 which he upgrades the secondary and leaves the primary stock. No dyno sheets have been provided yet but will be posted in a few weeks - still waiting for artguys dyno sheet with his M2s which should yield great numbers.