Stock is good but slightly modified can be so much better. Start with the restrictive exhaust.
"Better" is subjective and exactly why I wrote what I did. She pings a tad if I do full throttle, but that's who she is. I'm not racing, I'm motoring. So, I'll take .5 seconds more to hit 60. BFD. Her stock sound is perfect, because it is HER sound. I love it! I also love the sound of a flat crank mustang V8, Subaru STI, Ferrari 12 cyl , and many Harley's.