[WARP TEN]

Originally Posted by -=Jeff=-

So you had this system on your car and you know it does not reduce drone?

Resonance is an interesting thing I have to wonder, if you used that design with some muffler between and then real muffler at the end.. would there be drone?

No, Jeff, I did not have this system on either of my cars. But over the course of 20 years with ZR-1s I experimented with and tested about a half dozen exhaust systems, worked with an acoustics engineer to dissect and analyze the problem of resonance on our ZR-1s, and evaluated which systems can reduce it and why. The "droning" that everyone refers to is essentially two resonance peaks that occur naturally at roughly 1,800 and 3,400 rpms on LT5s and other Corvette V8s. When the engine is placed under load at these rpm points one gets fairly intense "droning" unless it is mitigated. About the only way to reduce this resonance is to utilize Helmholtz resonators in the mufflers and resonator as the stock and Corsa systems do. They are specifically designed chambers in which sound waves of the "drone" frequencies cancel each other out. Since I did not see any mufflers in the pictured system that appear large enough to accommodate them, I assumed that they are not in this system and therefore "drone" is likely. I could be wrong, though. Mufflers alone (i.e., without Helmholtz resonators) do not normally reduced resonance.--Bob