Compression ratio, valve opening and closing events (camshaft), intake manifold, exhaust manifolds or headers all play a part. Unless you can find the same car with same engine build, drivetrain, rear gear and exhaust system, yours may drone and other persons may not. It's a trial and error process. You're unwilling to try removing X because it "might" be too loud, the VT's are robbing power, you've tried a few different mufflers and don't want to try any more, I'd say you're at the end of the road. Turn up the radio or buy some ear plugs.
|