i used to own an Eisenmann Race Quad, i love the sound as it is bassier than akra ( raspy), but with my AR Design downpipes, it is just too loud (could be the loudest e92 then,hahah, love the high RPM sound, sigh i miss it right now) but yeah i have sold it since, and went to everco to replicate the quad pipes, so still with my downpipes, it sounds like having an aftermarket exhaust.
its not a remap, its a piggyback ECU, an add on which it bypasses your original ECU, much better and safer than remaps IMHO, doesnt uses your origiinal ECU at all, and its transferable. means you can sell it later on. the price determines where you get it from, if you get it directly from US, you can get it at half the price here/singapore.
Proceed is twice the price of JB4. Proceed is faster and also has the temp wastegate fix. ( if your turbo wastegate is rattling, which is a common problem for our cars)
My take is, the brakes comes first... if you are up for runs, better brake pads and steel brake hose is a must upgrade. follow by the piggyback tune and air filter (whether drop in/ dual cone ) if you have money, coilovers and sway bars are good too. Handling of the car always come hand in hand with your power upgrades so that you can always control the car.