VIDEO | Milltek midpipe + secondary cats delete

ochoyasinco · 12-21-2025, 05:17 AM

Featured on BIMMERPOST.com

As you know, the G9X M5 is very quiet OEM, quieter than my Dyson. Especially here in the EU with OPFs and valves. It was time to unleash the V8.

I have put a Milltek midpipe and went catless for the secondary downpipes as they have no sensors. Really happy with the setup. Much cheaper than a catback and as loud, while retaining OEM mufflers. No errors.

On the video some dyno runs (before/after) - extra 30 hp from the new setup without tuning - 790 HP / 1120 Nm. 0.3 second faster as well on the 100-200 kph. You will also find some fly-bys of course. Enjoy the watch!

mike@x-ph.com · 12-23-2025, 05:11 PM

ochoyasinco · 01-04-2026, 03:00 PM

1 month review. The sound is a perfect match for the G90. This setup gives a deep V8 rumble to the M5 and made the car such a joy to drive. Cold starts, downshifts and upshifts all sound so good.

Still no errors even by going catless on the secondary downpipe. Same for OPF, BerkPerformance here in the Netherlands - who installed the exhaust - also flashed the software.

Here is a picture with the stock dyno runs vs the new exhaust setup. No tuning/calibration has been done, ECU still locked. The car feels faster.

And these are the 100-200 + 200-250 times.

12-21-2025, 05:17 AM	#1
ochoyasinco @M5NOIR 177 Rep 65 Posts Drives: G90 M5 Join Date: Dec 2022 Location: NL iTrader: (0)	VIDEO \| Milltek midpipe + secondary cats delete \| Install & Review Featured on BIMMERPOST.com As you know, the G9X M5 is very quiet OEM, quieter than my Dyson. Especially here in the EU with OPFs and valves. It was time to unleash the V8. I have put a Milltek midpipe and went catless for the secondary downpipes as they have no sensors. Really happy with the setup. Much cheaper than a catback and as loud, while retaining OEM mufflers. No errors. On the video some dyno runs (before/after) - extra 30 hp from the new setup without tuning - 790 HP / 1120 Nm. 0.3 second faster as well on the 100-200 kph. You will also find some fly-bys of course. Enjoy the watch! __________________ 08/22 - 04/24 : G20 M340i Black Sapphire 04/24 - 10/25 : G80 M3C Skyscraper Grey 10/25 - now : G90 M5 Individual Frozen Black Last edited by ochoyasinco; 01-04-2026 at 03:01 PM..
	Appreciate 1 beholdem25.50 Tweet Quote

12-23-2025, 05:11 PM	#2
mike@x-ph.com Joint Chiefs of Staff 32769 Rep 206,054 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	__________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 725-221-5267
	Appreciate 0 Quote

01-04-2026, 03:00 PM	#3
ochoyasinco @M5NOIR 177 Rep 65 Posts Drives: G90 M5 Join Date: Dec 2022 Location: NL iTrader: (0)	1 month review. The sound is a perfect match for the G90. This setup gives a deep V8 rumble to the M5 and made the car such a joy to drive. Cold starts, downshifts and upshifts all sound so good. Still no errors even by going catless on the secondary downpipe. Same for OPF, BerkPerformance here in the Netherlands - who installed the exhaust - also flashed the software. Here is a picture with the stock dyno runs vs the new exhaust setup. No tuning/calibration has been done, ECU still locked. The car feels faster. And these are the 100-200 + 200-250 times. Last edited by ochoyasinco; 01-04-2026 at 03:07 PM..
	Appreciate 3 beholdem25.50 wingflex333.50 Stockholmarn645.00 Quote