narkotic

iTrader: (3)

Just for the sound, mainly.

Examples here.

Has anyone done this, or know of a shop that could fab something like this?

Z1 Performance

iTrader: (564)

any experienced tuning shop that works on turbo setups should be able to handle this. Just make sure they have done it before, as you want to make sure you have a very smooth transition bringing the wg gasses into the downpipe, to minimize reversion