[Tifosi]

I suspect a properly tuned SPICA system will have fewer emissions and better fuel economy

Likely a bit broader powerband too, or at least that's my very small grasp on the comparative.

If it's purely a noise thing, you can put stacks and such on the SPICA intake.
It won't gain you any power (might even lose some actually as the stock airbox is VERY well designed) but it'll make cool sounds simular to carbs.

 

[Tifosi]

Not never gonna talk someone out of something they truly wanna do, but some convincing counterpoints can be had to mabe make one think about it a bit more and base things more on rational decision making rather than an impulse choice.