I was looking to get a decat and screamer pipe but after reading into then there seems to be a lot of hate for them so I would just like to know what sort of work is involved fitting and setting up an external wastegate, currently everything is stock but I am planning full exhaust, manifold and fmic. Where do they bolt to and what sort of spring would I need when I eventually get round to doing it. Thanks in advance wanting to learn as much as possible as I'm new to the Starlet scene