Well, after 6 failed attempts, why not try again? So here it goes… With manifold number 7, we took a deep dive and looked at all of our previous data. We saw a few elements that made power or had the potential to assist in making power, so we used those elements to design manifold number 7. Most of you probably overlooked the fact that manifold number 6 had pretty good improvements in the 3500 to 4000 RPM range when compared to OEM, and without mention, failed miserably at the higher RPM range. With manifold number 5, we modified our flange design and kept the larger runner diameter where it made the best power, but still less than OEM. We combined these manifolds and made a few tweaks to build manifold number 7. We kept the small plenum design and increased the runner diameter, yet again. These changes led to basically matching OEM power (well slightly higher than OEM), but peaks at 6550 instead of 6800. What it does do is increase horsepower and torque from 3900 to redline. There is a little hiccup from 4600 to 4900, but I have a feeling that actual tuning for the manifold could fix this.
Looking forward to comments and questions, we will be updating again after we add a full exhaust system.
