Superchargers and cat less exhaust

Ilikemike · 11-10-2014, 07:28 PM

Do we need to run catless systems with SC's like the Harrop? Or will the system adjust to the increased back pressure.

MFL · 11-10-2014, 07:37 PM

Cats are not your friend. Remove them. Be Happy.

You can also do High Flow Cats if you have a man bun and more than one pair of Tevas.

BPMSport · 11-10-2014, 07:45 PM

It's preferred to have them removed, although you can run it with a catted setup with no issues. There has been testing performed with the stock cats and the Harrop Supercharger.

Apex Missing Ape · 11-10-2014, 08:21 PM

Quote:

Originally Posted by Mike Benvo

It's preferred to have them removed, although you can run it with a catted setup with no issues. There has been testing performed with the stock cats and the Harrop Supercharger.

How much will running cats handicap the setup?

ashtaron14 · 11-10-2014, 09:05 PM

Quote:

Originally Posted by Mike Benvo

It's preferred to have them removed, although you can run it with a catted setup with no issues. There has been testing performed with the stock cats and the Harrop Supercharger.

I'll be darn-diddly yarn. Stock exhaust system, OEM Mod is what I'm running.

TommyLights · 11-10-2014, 09:15 PM

I ran catted for 4 months. The system only made moderate power. Turned into an animal the second the cats came off. Take em off.

WickedE93 · 11-10-2014, 09:17 PM

Take it off! Take it off! Take it off!

AlpineE92M3 · 11-10-2014, 09:29 PM

Cat less on non-SC makes the world of difference...I can only imagine on SC cars...Probably a better idea to take them off, if Ur looking for the most power gains.

BrewRifle · 11-11-2014, 08:00 AM

Quote:

Originally Posted by Mike Benvo

It's preferred to have them removed, although you can run it with a catted setup with no issues. There has been testing performed with the stock cats and the Harrop Supercharger.

What sort of gains did you see with running cats vs catless?

I'm running stock cats, but a titanium race exhaust so I'm curious to know the potential gains with going with HFC's + supercharger.

maloo · 11-11-2014, 08:03 AM

Split the difference and run a test pipe instead of the primary cats. You would still retain the secondary cats with this set-up.

11-10-2014, 07:28 PM	#1
Ilikemike Lieutenant 251 Rep 550 Posts Drives: E92: F82: M2C: M2 CS (Now) Join Date: Sep 2010 Location: Port Moody B.C iTrader: (0)	Superchargers and cat less exhaust Do we need to run catless systems with SC's like the Harrop? Or will the system adjust to the increased back pressure.
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11-10-2014, 07:37 PM	#2
MFL Major 174 Rep 1,246 Posts Drives: E92 M3 Join Date: Sep 2013 Location: Bellevue, WA iTrader: (3) Garage List 2010 BMW M3 [9.00]	Cats are not your friend. Remove them. Be Happy. You can also do High Flow Cats if you have a man bun and more than one pair of Tevas.
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11-10-2014, 07:45 PM	#3
BPMSport BimmerPost Supporting Vendor 3387 Rep 7,541 Posts Drives: Harrop M3 / F10 M5 / F82 M4 Join Date: Apr 2008 Location: SoCal iTrader: (9) Garage List 2000 BMW M5 [0.00] 1990 BMW 735i Turbo [0.00] 2008 BMW M3 [7.50] 2015 BMW M3 [0.00] 2015 BMW M5 [0.00]	It's preferred to have them removed, although you can run it with a catted setup with no issues. There has been testing performed with the stock cats and the Harrop Supercharger. __________________ -----\| Like us on Facebook \| Instagram \|\| Tuning Information \| Remote Coding \|----- ----Visit us at www.BPMSport.com - Emotion. Driven. \| Toll Free: (888) 557-5133----
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11-10-2014, 09:15 PM	#6
TommyLights Colonel 213 Rep 2,602 Posts Drives: Man Join Date: Jul 2010 iTrader: (12)	I ran catted for 4 months. The system only made moderate power. Turned into an animal the second the cats came off. Take em off. __________________ https://t.me/pump_upp
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11-10-2014, 09:17 PM	#7
WickedE93 Major 224 Rep 1,131 Posts Drives: White E93 M3 Join Date: Feb 2014 Location: Pico Rivera iTrader: (2)	Take it off! Take it off! Take it off!
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11-10-2014, 09:29 PM	#8
AlpineE92M3 Currently Driving 269 Rep 1,426 Posts Drives: BPM tuned '13 AW ZCP E92 M3 Join Date: Sep 2012 Location: Rochester, NY iTrader: (9) Garage List 2013 BMW E92 M3 [0.00] 2011 BMW M3 [0.00]	Cat less on non-SC makes the world of difference...I can only imagine on SC cars...Probably a better idea to take them off, if Ur looking for the most power gains.
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11-11-2014, 08:03 AM	#10
maloo First Lieutenant 52 Rep 303 Posts Drives: M2 Join Date: Sep 2014 Location: NH iTrader: (0)	Split the difference and run a test pipe instead of the primary cats. You would still retain the secondary cats with this set-up.
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