New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   New 2009 2010 BMW Z4 - ZPOST > BMW Z4 Forum (E89) > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications

Post Reply
Thread Tools Search this Thread
      08-02-2011, 07:41 AM   #1
bin karama
New Member
Drives: E89 - 2012 Z4 sDrive35is
Join Date: Jan 2011
Location: United Arab Emirates

Posts: 9
iTrader: (0)

catalytic converter??

so i heard alot about this but i want your experience guys what do yout think is it true or not ?
if i take the catalytic converter off makes my car breath better ..better torque and better and the car becomes louder !!!!! ..

if it is true ..dose it harm the car ???
bin karama is offline  
Reply With Quote
      08-02-2011, 08:15 AM   #2
Lieutenant Colonel
ZheHbKa's Avatar
Drives: the Wind
Join Date: Jul 2007
Location: NYC

Posts: 1,795
iTrader: (0)

Garage List
2014 BMW 335 Xi  [5.00]
i read somewhere that the sound changes drastically, some like it some hate it
2014 F30 335 X-Drive | 6-MT | Alpine White/Coral Red | ZMM ZDH ZDA |

ZheHbKa is offline   Russian Federation
Reply With Quote
      08-02-2011, 09:03 AM   #3
BLTZKRG's Avatar
Drives: 2011 Z4 sD35i
Join Date: Jun 2011
Location: NJ

Posts: 86
iTrader: (0)

Wouldnt it trip the error code? Also rattle the exhaust pipe hangers and bushings?? From experience on other setups...

I would like to know the info as well... like if I put a straight pipe from the cat all the way res or cats
BLTZKRG is offline   United_States
Reply With Quote
      05-18-2013, 01:30 PM   #4
New Member
Drives: 2011 Orion Silver Z4 SDrive35i
Join Date: Dec 2011
Location: Las Vegas

Posts: 15
iTrader: (0)

b1mmerbob is offline   United_States
Reply With Quote
      05-18-2013, 05:12 PM   #5
Drives: BMW
Join Date: May 2010
Location: GA

Posts: 540
iTrader: (8)

Our cars have two catalytic converter. The main one is on the down pipe. The main one does have sensors. If you get an aftermarket down pipe that has the fittings for the down pipe, it doesn't throw a code. The secondary catalytic converter doesn't have sensors and won't cause any code to show up.

Removing/replacing either one will cause an increase in the exhaust sound. Most doesn't like the combination of removing both if them because it cause the exhaust to sound very raspy.

Removing the secondary catalytic converter will not improve on performance gain as much as the down pipe. Down pipe will allow the turbo to spin more freely and reduce turbo lag and gain some power.
Hoa is offline   United_States
Reply With Quote
Post Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -5. The time now is 07:12 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.,,,,,,,,, logo and trademark are properties of BIMMERPOST