Yeah we simply lost power with these mods. Trust me I would have loved to have come back from my tune with rob and said I gained 10whp and was sitting at close to 330 with my build but I found myself in 306whp range after installing these parts. Again this could be a fluke. There may have been something that went wrong in the manufacturing of these parts. I'm not implying that Z1 is a bad company or that the same thing will happen to anyone else. This is simply what happened to me and my car. I hope this thread is of help to others. I wish I knew then what I know now.
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