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That's good info Gaurav Bhai, another one you can check is Skyline Garage in Al Quoz. They specialize in modifying exhaust as per your preferences and they might be able to do the job you are looking for.

Try the borla hushflow, I'm using same in my mustang. They are quiet as stock and give good noise and performance when pushed hard, with beautiful deep drone on highway.

If you have a big bore exhaust people are more likely to hear you coming and get out of your way. Loud pipes save lives! I don't know of any specific aftermarket manufacturers who make what you're looking for but it is completely doable with a bit of custom fabrication. Aston Martin for one example, the DB9 if I remember correctly has a switchable exhaust system. There is a solenoid operated valve in the system which routes the exhaust gas through extra silencers then opens under throttle to let the gas flow more freely. A lot of owners remove the fuse so the valve is always open and you always have more noise. I also recall seeing something similar on some BMWs although it was a vacuum operated valve towards the rear silencer. So yes, if you can find someone who can weld proficiently and has a little bit of know how, you can do it.