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Madhatter10-6 had a lot of trouble with his. I would know because I helped him with his build and without a good tuning software, 870cc top feed injectors do not play well with any of the available base tunes. His tune was for 850 side feeds but there is more to it than just injector size. Luckily he has a Zemulator so we were able to properly dial in the K values and void time. Before those changes, the car ran terrible. Now it runs great. It seems like a well made rail but the injectors were not made for the Z. If you have a tuning software, I would recommend them to anybody, otherwise I would not.
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