What do we know about the z1 lower intake manifold?

Mysilverz

Yes, I lost a lot of money and power. Z1 took their parts back but they wouldn't give me my cores back, so I had to go source new cores. Total cost between Dyno runs and used oem parts to prove I lost power $360. Total loss of power with the plenum and manifold was 10whp. Now I need to have my car retuned for the stock manifold setup. That will be another $300. Honestly the frustration of all of this has me seriously considering selling my car and moving on to something without a plastic clutch slave cylinder. Maybe it was a fluke that I lost power but how would you feel if you spent over $600 on parts that lost you 10whp. I would not recommend buying these two pieces.