You misunderstand my response. I wasn't being cheeky. I was asserting that in my own experience, money is best spent on music.
Where should I spend money to make my car perform better?
C. Leather seats
D. Convertible hard-top
E. Tires with low-rolling resistance
The answer is completely different, based on my definition of performance, and how my car currently performs. If I have a convertible, a hard-top is stupid. If I have a Land-Rover, low-resistance tires are counter-productive. If I have a 1989 Nova, leather seats would be hilarious, and maybe awesome, but money essentially wasted.
Without knowing your definition of performance, and without knowing anything useful about your current gear, any answers will be pure speculation. Poorly defined question. Also, I might add, this question gets repeated here over and over again. Rather than impugn my reading comprehension, try to search/read.