I agree with what others have said.
You have to consider your car's value, the full cost of going with a reliable BT setup (more than the car is worth at this point), and the reality of both performance and powerband.
I remember riding in my friends stock 335ix and thinking 'why am i wasting my time modding my A4'. A car like a 335i or STI is just on a completely different level bone stock. I could've gone BT and dumped thousands more into my car and still not have been as quick, meanwhile having a laggy car with a bunch of potential headaches. To each his own, but if you can afford a proper BT setup you can afford to upgrade to a faster car as well.
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