Catted downpipes questions

Ca86108 · 04-25-2017, 07:47 PM

1. Will I be able to pass CA smog with catted downpipes (high flow cats on downpipes AMS)
2. How much hp and torque loss would happen with catted vs decatted?

TheHouseWon · 04-26-2017, 09:19 AM

Catted dp's are not CARB approved so you wouldnt pass the visual, in theory.

RPiM5 · 04-27-2017, 05:40 PM

You will not pass Smog since the F10 M5 only has primary cats and no secondary cats.

You will gain a bit of horsepower, but mostly torque.

The turbos also spool a bit faster and so do the engine Rpms.

mike@x-ph.com · 05-16-2017, 05:37 PM

Quote:

Originally Posted by Ca86108

1. Will I be able to pass CA smog with catted downpipes (high flow cats on downpipes AMS)
2. How much hp and torque loss would happen with catted vs decatted?

Power will be the same with catless or high flow catted

They both are not emission legal

04-25-2017, 07:47 PM	#1
Ca86108 Private First Class 31 Rep 192 Posts Drives: 135i Join Date: Apr 2014 Location: Bay Area, ca iTrader: (1)	Catted downpipes questions 1. Will I be able to pass CA smog with catted downpipes (high flow cats on downpipes AMS) 2. How much hp and torque loss would happen with catted vs decatted?
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04-26-2017, 09:19 AM	#2
TheHouseWon Colonel 644 Rep 2,039 Posts Drives: 2013 M5 Join Date: Nov 2015 Location: SoCal iTrader: (10)	Catted dp's are not CARB approved so you wouldnt pass the visual, in theory.
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04-27-2017, 05:40 PM	#3
RPiM5 Major General 2873 Rep 7,885 Posts Drives: Black M5 Join Date: Apr 2012 Location: Earth 616 iTrader: (0)	You will not pass Smog since the F10 M5 only has primary cats and no secondary cats. You will gain a bit of horsepower, but mostly torque. The turbos also spool a bit faster and so do the engine Rpms. __________________
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