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Technical Topics B48 4-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications Catted or Catless downpipe ??

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      07-27-2020, 09:05 PM   #1
YONIg20
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Catted or Catless downpipe ??

Hey guys ! I have a 2020 330i b46 and was wondering what's the best downpipe and the difference between catted and catless.

I have an mst intake & bm3 stage 1!
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      07-28-2020, 09:43 AM   #2
mike@x-ph.com
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Catless is louder and have a fuel smell

Performance is the same on stock turbo
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      07-28-2020, 11:14 AM   #3
chris_portimaog20
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FYI according to my research, Catless is illegal in California other than for racing and off-road use if I'm not mistaken
u will also probably have to deal with Check engine lights if you go catless
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      07-28-2020, 11:23 AM   #4
YONIg20
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Quote:
Originally Posted by chris_portimaog20 View Post
FYI according to my research, Catless is illegal in California other than for racing and off-road use if I'm not mistaken
u will also probably have to deal with Check engine lights if you go catless
I wonder if our cars can do an axle back exhaust with clamps so there is no welding ( I have a lease) or a y pipe.
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      07-28-2020, 11:34 AM   #5
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Quote:
Originally Posted by YONIg20 View Post
I wonder if our cars can do an axle back exhaust with clamps so there is no welding ( I have a lease) or a y pipe.
the M performance exhaust is technically an axleback
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      07-28-2020, 11:36 AM   #6
YONIg20
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Quote:
Originally Posted by chris_portimaog20 View Post
Quote:
Originally Posted by YONIg20 View Post
I wonder if our cars can do an axle back exhaust with clamps so there is no welding ( I have a lease) or a y pipe.
the M performance exhaust is technically an axleback
But soooooo expensive lol
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      07-28-2020, 03:15 PM   #7
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Just don't buy a VRSF downpipe whatever you do.
They sold me one claiming it would fit my B48 G20. It didn't. After 4 weeks of contacting them almost daily, I gave up. They simply didn't want to know.

My car is an EU car with the GPF in the exhaust which means the connection between downpipe & centre section is different to US cars.

I'm sure it was an easy mistake for VRSF to not know the difference - but their after sales are so shocking I'd implore everyone to shop elsewhere
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