[CLEAN]

When you say you want it louder, do you mean under normal driving, or even when the valves are open? On the vette, you can pull a particular fuse which leaves the valves open all the time. Another option is one that I have on my GS, it's a little metal collar that you put on the valve actuation rod that keeps the valve from closing all the way shut. Where you secure the collar determines how much the valve stays open, and thereby how much sound it makes. At WOT, the valves still fully open as they normally would.