[mj222222]

Has anyone upgraded the downpipe on their 40i? I am considering doing it before I add a tune and maybe a cold air intake. Open to any and all input.

[dmanb2b]

Unless the ECU was made before June 2020, it can't be tuned yet. Cold air intake is for sound only. Tune will give dealer plenty excuses to void powertrain warranty. All that said, I'd tune our in a heartbeat if I could.

[mj222222]

Originally Posted by dmanb2b

Unless the ECU was made before June 2020, it can't be tuned yet. Cold air intake is for sound only. Tune will give dealer plenty excuses to void powertrain warranty. All that said, I'd tune our in a heartbeat if I could.

mine is a 2019 so I am good on that side of things and only got about another year of warranty based off mileage

[dmanb2b]

Originally Posted by mj222222

mine is a 2019 so I am good on that side of things and only got about another year of warranty based off mileage

Lucky...I would highly recommend a catted dp from Active Autoworks and a bm3 (I run this combo on my 340) or mg flasher tune. ECU may still need a bench unlock, but it can be done. Stage 2 93 tune would put you around the 400/400 mark and more if you have ethanol available to run a e30 mix.