A downpipe would genuinely only be described as a benefit with a tune. An APR stage II in addition the downpipe would offer you a very nice gain without having to improve the stock turbo/intercooler/motor mounts/tires etcetera. At this time, you will have to evaluate the length with the eaves https://jaredpvae95284.fliplife-wiki.com/3407858/demystifying_downpipes_a_closer_look_at_catless_vs_catted_downpipes