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the 17* pump will hold a higher PSI but it also depends on the health of both pumps..sometimes the 15* will hold better..you are correct on the injectors but when in the truck it doesn't make much of a differnts..they will make good cores though...the turbo on a 99.5 sits higher and is bigger then the 97and E99 and i believe the driver side manifolds are different on the 97..for them reasons the up pipes will not work for you unless you swapped over everything from the manifold up..