The Syms headers were designed for the factory turbo cars. They will fit the EJ25, but they don't clear the crossmember. If you replace that, however, they fit fine. On the other hand, they won't mate up properly to the Vishnu turbo kit. If you're willing to do the work, however, you can use everything but the plumbing from the turbo kit and get the rest (from header outlet to exhaust) fabricated. It'd be a cool setup, but it's a lot of work. If I remember correctly, Imprezer is using these for his custom turbo setup. If you decide to go for it, let us know.