I will be fitting aftermarket turbo to my BF soon and I wish to make my own dump pipe. Now I've searched high and low to try and find where the best place would be to plumb the external wastegate outlet back into the main exhaust. Although I haven't come across any articles on it, From pictures I've seen I can deduce there seem to be 3 main designs. 1. Plumbed in at the start of the dump pipe, Just after the exhaust housing. 2. Plumbed in at the end of the dump pipe, before the main exhaust. 3. Plumbed in after the catalytic converter. I would think number 3 would be illegal due to emissions, but may have an advantage over the others due to the pressure drop across the cat. So does it make that much difference where it's plumbed in, Or are all the gasses flowing that quick it doesn't matter? Regards Mitch