Riss Racing catless down pipe's(ceramic coated)

JYS Group · 11-28-2009, 09:35 PM

I have question about the down pipes.....
I understand that the down pipes helps turbo to bring more power..
but what i do not understand is difference between catless and catted..
anyone can explain about this? thank you...
ps. what is the ceramic coated and the polished? ? im interested in the RR product any feedback of this product?

shochu75 · 11-28-2009, 10:26 PM

The suffix "-less" is often added to nouns to connote a lack thereof... soooo downpipes without catylitic converters are referred to as "catless" and downpipes with catylitic converters are referred to as "catted".

There are high flow catted downpipes, but for best flow and consequently, power, a catless pipe is optimal (most notably because it has no obstructions)

Ceramic coating is for heat management, some people will argue that it protects the pipe itself from corrosive environments.

Polished finishes serve purely aesthetic functions.

The whole idea of power from downpipes comes from the idea that the exhaust (hot) side of the turbo can expel exhaust gas more efficiently because there is no obstruction immediately following the turbine.

SV Concepts III · 11-29-2009, 12:41 PM

Well said!

RBC · 11-29-2009, 01:36 PM

Quote:

Originally Posted by ycs23

I have question about the down pipes.....
I understand that the down pipes helps turbo to bring more power..
but what i do not understand is difference between catless and catted..
anyone can explain about this? thank you...
ps. what is the ceramic coated and the polished? ? im interested in the RR product any feedback of this product?

Has anyone dynoed catted vs catless? It would be interesting to see the diferences...

If there is only a 5hp difference, the Catted version should an excellent option!

http://www.e90post.com/forums/showpo...9&postcount=34

11-28-2009, 09:35 PM	#1
JYS Group Private First Class 5 Rep 162 Posts Drives: E93 335i Join Date: Feb 2007 Location: weehawken, NJ iTrader: (0)	Riss Racing catless down pipe's(ceramic coated) I have question about the down pipes..... I understand that the down pipes helps turbo to bring more power.. but what i do not understand is difference between catless and catted.. anyone can explain about this? thank you... ps. what is the ceramic coated and the polished? ? im interested in the RR product any feedback of this product?
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11-28-2009, 10:26 PM	#2
shochu75 Private First Class 5 Rep 126 Posts Drives: e90 Join Date: Apr 2009 Location: honolulu iTrader: (0)	The suffix "-less" is often added to nouns to connote a lack thereof... soooo downpipes without catylitic converters are referred to as "catless" and downpipes with catylitic converters are referred to as "catted". There are high flow catted downpipes, but for best flow and consequently, power, a catless pipe is optimal (most notably because it has no obstructions) Ceramic coating is for heat management, some people will argue that it protects the pipe itself from corrosive environments. Polished finishes serve purely aesthetic functions. The whole idea of power from downpipes comes from the idea that the exhaust (hot) side of the turbo can expel exhaust gas more efficiently because there is no obstruction immediately following the turbine.
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11-29-2009, 12:41 PM	#3
SV Concepts III Lieutenant General 380 Rep 16,968 Posts Drives: BMW Duh Join Date: Apr 2005 Location: Santa Clara iTrader: (13)	Well said!
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