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I am wondering what the ID of the tubes that are on your aftermarket 1jz manifolds?, or even what size the mk 4 manifolds are?. I am starting my twin GT28R turbo set up and I am not sure if I should go 1 1/2", 1 5/8" or 1 3/4" inside diameter. The exhaust ports are about 1 3/8", but I ported them out to 1 1/2" the size of the gasket.
I know that the smaller the runners the faster the exhaust will be moving to get the turbo's spooling, but I dont want it to be choked in the top end.
I know that the smaller the runners the faster the exhaust will be moving to get the turbo's spooling, but I dont want it to be choked in the top end.