Loudest FZ exhaust?

I have a Delkevic exhaust for almost 2 years and it looks as good as the day I installed it. I have a local shop that has about 60 different sport bikes....from street to full on race bikes. Every exhaust you can imagine is there to see and compare. Some look prettier but I don't see a huge gap in quality. Per Vcyclenut who does my flashes, bikes will actually loose performance with a cat delete and slip on exhaust if it's not flashed. Personally, I believe that any brand cat delete and slip on performance are going to be just about identical after flashing the ECU. When you talk to independent tuners, almost all will tell you that there's very little performance increase with a new exhaust. Exhaust manufacturers on the other hand tell you that there are substantial gains and or you don't need a flash with their product. I take it all with a grain of salt. Meanwhile, by buying a $400 Delkevic over a Graves allowed me to just about pay for a K-Tech rear shock.          

My bike is already flashed by 2wdw. I’ll be sending the ecu back to them to be re-flashed for whatever exhaust I end up going with. I’m leaning towards the sc project at the moment. I like the looks and I’m told they’re pretty loud.

My bike came with a delkevic on it 8in shorty cat delete . It sounded great but way to loud for my taste after riding it a few times, even the wife said it sounded good.

Correct me if I'm wrong again but they design them to work with stock mapping I can recall the diameter of the pipe smaller then stock to limit the flow to match stock ecu again they come lean from the start .
The bike I almost bought had the AR cat delete and it was amazing sounding like grand prix kinda sound but I did not ride it to get the full effect of its glory. If my ears could take it with ear plugs in and if I did not listen to jams in the helmet that would be the system.