I'm not too familiar with the newest system from K40 but I have had experience with their older systems and IMHO it didn't work too well compared to some of the alternatives that were on the market. I'm not sure if their newer systems have improved since then. I can however tell you that it is possible for stereo installers to put the SR7/SRX in without additional holes in the firewall because my local stereo shop (benchmark motoring) does that. They keep everything OEM so it can all be reversed. Just as long as you look for a good shop that does that then you're good to go.