Wiring harness, s3 8p, Bose

[Max Read]

Hi guys,

I assume this topic has come up a 1000x before!

I have a 2008 s3 8p with Bose system and Audi concert head unit. No steering wheel controls.

Need/want to get a pioneer double din fitted but need to make sure I order the right harness. People I have spoke to are unsure of what I need "quad lock" or not?

Can anyone give me some clarification or what to go for, making sure all speakers work and no issues etc please?

Thanks in advance!