I'm getting a slammed brz next week. Want to know where to go for install in Toronto. I have an upgraded touchscreen coming with the car but thinking of using my alpine inaw900 and thinking focal speakers. I also have a 12" alpine Rd sub. I have 2 jl audio amps currently a jl 4300 and a jl 10/500. I was using the 4300 to run infinity reference components and no issues. However the smaller jl 10/500 would power the sub but shut down after using heavily. My question is will the 4300 power focal components and should I upgrade the sub amp to eleviate shutdowns?