Can anyone tell or explain me (kind of noob to the boost) the differences, benefits, advantages or disadvantages on:
External Wastegate Dump and Wastegate Dumps Into Exhaust????
And if I go stage 2 of ZZP turbo kit do I really need the Blow Off Valve???

Thank you

forgot to add, have in mind that I'm trying to make the car look in a way that ppl think is just a NA cobalt ( i'll be probably shaving the SS badges so ppl can think is a regular or LTZ model)