Generally manifolds that are listed for T3/T4 are just a T3 flange. They are listed as T3/T4 because that was the hot ticket for turbo's before aftermarket performance turbos were really available. It's a T3 exhaust side with a T4 compressor side.
You can get T4 flanged turbos which are not T4's which could be useful to you. Garrett have some 30 and 35 series exhaust housings with a T4 flange. Or of course you could run a GT40.
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