[Dean]

Coated DP is unnecesary, though it is a good idea onteh up.

I am a firm believer in divorced wastegate pipe. The longer the better. My BP merges after the bend at the bottom.

I would encourage you to keep at least one cat. High flow is fine. It will make any future smog requirements they might add most likely passable, and it does help the environment.

On the exhaust, I would suggest having a removable "silencer" so if you get a fix-it ticket for noise, or just want a quiet drive somewhere, you can slap it in.

And yes, I would get a tune after a turbo back...