1. The audible difference is not intrusive with a DP only on a 30d, You will hear a bit more spool but the rest of that system will keep it not sounding like a truck!
2. Consumption improvement is definitely there, it all depends how you drive afterwards.
3. Resale value is dependent on whose buying the car, Please ensure you take your old dp and cat away with you for later if you decide to return the car to stock. A good installer will not molest any of the old pipes and returning the car to stock should not be visible.
4.+5. There should be no negative reliability issues, only positive ones. The bigger, smoother and unrestricted down pipe will assist to evacuate hot exhaust gasses out the turbo faster and creating less heat soak and increasing the longevity on the turbo itself. There is a caveat to this, if the turbo (and i am not relating to yours specifically) has had a tough life and is causing a bit of oil to burn then removing the factory cat will unmask the issue. Sadly the down pipe is then blamed for causing this smoking incorrectly. I am not to familiar on your 30d exhaust layout but there should be a cat closest to the turbo and depending on the model of 30d you have an optional DPF afterwards. If you remove the DPF then you can expect some soot collecting on your tail pipes as well as on the boot if not washed regularly.
In summary, do the DP, you wont make a mistake...
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