Diesels commonly react finest to tuners…the factory tends to tune them conservatively to attenuate EGTs, but should you’re prepared to roll the dice a bit a tuner is admittedly all you require. I don’t think you ought to mess Along with the downpipe Until it’s Element of a package. Jose https://excellentopolis.com/unleashing-performance-exploring-downpipe-options-for-the-audi-rs6-c8/