hatless downpipes

marillo · 02-19-2022, 08:27 AM

Can anyone tell me about their experience with this mod -
Have a 2022 x5 m50
I dont really know anything about this so this may sound silly but what does the downpipes actually do ? Are they removing the catalytic converter (ie. catless) ?
What does this do to fuel performance if anything?
How does it affect sound ? what note/tone changes ?
Do I need to pair it with a res delete ? advantage/disadvantage of not deleting ?

omasou · 02-19-2022, 08:55 AM

Removes the cats to allow unobstructed flow.
Not sure about MPG.
Obnoxiously loud
The rear cats if not removed will likely fail sooner b/c they are doing the job of both.
Need to retune car b/c not designed for it
Need to code out O2 sensors.
Will fail emissions.

02-19-2022, 08:27 AM	#1
marillo Private First Class 36 Rep 107 Posts Drives: Volvo XC60 Join Date: Dec 2021 Location: canada iTrader: (0)	hatless downpipes Can anyone tell me about their experience with this mod - Have a 2022 x5 m50 I dont really know anything about this so this may sound silly but what does the downpipes actually do ? Are they removing the catalytic converter (ie. catless) ? What does this do to fuel performance if anything? How does it affect sound ? what note/tone changes ? Do I need to pair it with a res delete ? advantage/disadvantage of not deleting ?
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02-19-2022, 08:55 AM	#2
omasou Brigadier General 2087 Rep 3,005 Posts Drives: BMWs Join Date: Apr 2016 Location: US iTrader: (4) Garage List 2023 BMW S1000RR [0.50] 2022 BMW F900XR [3.00] 2022 BMW X6 40i [0.50] 2020 BMW M2C [9.50]	Removes the cats to allow unobstructed flow. Not sure about MPG. Obnoxiously loud The rear cats if not removed will likely fail sooner b/c they are doing the job of both. Need to retune car b/c not designed for it Need to code out O2 sensors. Will fail emissions.
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