Secondary Cat Delete-great mod! - BMW M5 Forum and M6 Forums
E63 BMW M6 Forum and BMW M6 Convertible | m6board.com 2005- Advertiser's Forum.

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 78 Old 25th October 2006, 09:02 PM Thread Starter
deknight
m5board.comoholic (>1000 posts)
 
deknight's Avatar
 
Join Date: Nov 2005
Location: Los Angeles, CA
Posts: 1,277
Thanks: 72
Thanked 35 Times in 30 Posts
Thumbs down Secondary Cat Delete-great mod!

I had my secondary cats removed by Evosport a couple weeks ago and really like the results. There is better throttle response now especially off the line. I remember when I first drove the M6 I thought I left the parking brake on or left it in nuetral since it was so sluggishly delayed starting out. Now it is more instant. I do not know how much hp or torque gain if any, but the car feels quicker. Sorry for the seat of pants only measurment.

Secondly I loved the sound of the Eisenmann race exhaust, but would have liked more low end growl and there was some serious bass resonance around 3400 rpms in the cabin that was a little too loud for most passengers. Of course it only happened at or around that rpm. Now with the 2ndary cats out I have the low end bassey growl and the resonance is gone!

This is a video of the exhaust sound after 2ndary cats out.
http://www.youtube.com/watch?v=Qlrjox2am9I


This is a video comparing the before and after taking cats out.
http://www.youtube.com/watch?v=Zv3L5qR0NoI

Enjoy I hope this is helpful.

deknight

2007 Nurburgring Blue M6 Full Black Int, carbon fiber, HUD, Ipod inter., charcoal filters out, BMC filters,
Comfort Access, Eisenmann Race exhaust, Evosport 3.91 2 clutch LSD, Vorsteiner Carbon Fiber hood,
HRE 545r 20" wheels, Evosport Pulley, Hartge springs, 20 mm HR frnt spacrs
Dinan Front Roll control, Dinan rear sway, Dinan Camber 650i Camber plate, Evosport Headers.and Section 1 high flow cats,
RPI Ram Air, Evosport Stage 2 S/W, AC Schnitzer rear wing & front splitters, Hamann apron.
2007 Alpine White Z4 M Coupe, Supersprint Sport Exhaust, X-pipe and Section 1,
Ground Control Coil Over, APR GTC 200 Rear Wing & Front Canards.
2002 blue water M5- Gone but not forgotten!!
Dinan Exhaust, Dinan Flywheel, Dinan Stage 2 software
Supersprint x-pipe, AA CAI, short shift kit , Dinan Stage 3 Koni suspension.
deknight is offline  
Sponsored Links
Advertisement
 
post #2 of 78 Old 25th October 2006, 09:08 PM
psybj
Member, Sport: On DSC: Off
 
psybj's Avatar
 
Join Date: Jan 2006
Location: Baton Rouge, LA, USA
Age: 76
Posts: 264
Thanks: 0
Thanked 17 Times in 10 Posts
????????????????????????????????????

Great. That tiny delay can be bothersome.

What was the cost?

Could there be any problems with warranty?

Where can it be done?

Any performance numbers?

TIA

psybj
'13 ///M6 Coupe
'05 MINI Cooper S Convert (about gone)
'65 Shelby Cobra (continuation), 650 hp (temporary)
'09 Hyundai Genesis V8 Sedan

PREVIOUS:'09 911S, '06 M6, '02 M3 SMG, '01 M3 6sp, Acura 3.0CL, Dodge Stealth TT AWD, VW Thing, Acura Legend Cpe, Honda Interceptor, Honda Prelude, M-B 450SL, Piper Cherokee 180, Rx 7, 280Z, deTomaso Pantera, 260Z, Datsun 510 2dr, Harley-Davidson, little motorboat, MGA Mk.II, VW bugs, Triumph TR-3A, Renault Dauphine, James, Chrysler HEMI, etc
psybj is offline  
post #3 of 78 Old 25th October 2006, 09:33 PM Thread Starter
deknight
m5board.comoholic (>1000 posts)
 
deknight's Avatar
 
Join Date: Nov 2005
Location: Los Angeles, CA
Posts: 1,277
Thanks: 72
Thanked 35 Times in 30 Posts
It takes between 2 to 3 hours of labor and materials is the cost of stainless steel piping to replace the cat. Cannot comment conclusively on the warranty but it is such a cheap mod that if needed they simply be put back in.

deknight

2007 Nurburgring Blue M6 Full Black Int, carbon fiber, HUD, Ipod inter., charcoal filters out, BMC filters,
Comfort Access, Eisenmann Race exhaust, Evosport 3.91 2 clutch LSD, Vorsteiner Carbon Fiber hood,
HRE 545r 20" wheels, Evosport Pulley, Hartge springs, 20 mm HR frnt spacrs
Dinan Front Roll control, Dinan rear sway, Dinan Camber 650i Camber plate, Evosport Headers.and Section 1 high flow cats,
RPI Ram Air, Evosport Stage 2 S/W, AC Schnitzer rear wing & front splitters, Hamann apron.
2007 Alpine White Z4 M Coupe, Supersprint Sport Exhaust, X-pipe and Section 1,
Ground Control Coil Over, APR GTC 200 Rear Wing & Front Canards.
2002 blue water M5- Gone but not forgotten!!
Dinan Exhaust, Dinan Flywheel, Dinan Stage 2 software
Supersprint x-pipe, AA CAI, short shift kit , Dinan Stage 3 Koni suspension.
deknight is offline  
post #4 of 78 Old 25th October 2006, 10:20 PM
M6Rida
Member, Sport: On DSC: On (>100 posts)
 
M6Rida's Avatar
 
Join Date: Oct 2006
Location: Los Angeles,CA
Posts: 164
Thanks: 0
Thanked 1 Time in 1 Post
speechless.....i dont know whether i want the second cats removed though. the eisenmann exhaust mite be ok w/ me- but ill most likely end up doin what you did. sweet car- plannin any exterior mods(kit,wheels)??
M6Rida is offline  
post #5 of 78 Old 25th October 2006, 10:37 PM Thread Starter
deknight
m5board.comoholic (>1000 posts)
 
deknight's Avatar
 
Join Date: Nov 2005
Location: Los Angeles, CA
Posts: 1,277
Thanks: 72
Thanked 35 Times in 30 Posts
My exterior mods include Vorsteiner Hood and painted grills. Wheels coming soon...



Secondary Cat Delete-great mod!-side-clean.jpg

Secondary Cat Delete-great mod!-pic_0500.jpg

deknight

2007 Nurburgring Blue M6 Full Black Int, carbon fiber, HUD, Ipod inter., charcoal filters out, BMC filters,
Comfort Access, Eisenmann Race exhaust, Evosport 3.91 2 clutch LSD, Vorsteiner Carbon Fiber hood,
HRE 545r 20" wheels, Evosport Pulley, Hartge springs, 20 mm HR frnt spacrs
Dinan Front Roll control, Dinan rear sway, Dinan Camber 650i Camber plate, Evosport Headers.and Section 1 high flow cats,
RPI Ram Air, Evosport Stage 2 S/W, AC Schnitzer rear wing & front splitters, Hamann apron.
2007 Alpine White Z4 M Coupe, Supersprint Sport Exhaust, X-pipe and Section 1,
Ground Control Coil Over, APR GTC 200 Rear Wing & Front Canards.
2002 blue water M5- Gone but not forgotten!!
Dinan Exhaust, Dinan Flywheel, Dinan Stage 2 software
Supersprint x-pipe, AA CAI, short shift kit , Dinan Stage 3 Koni suspension.
deknight is offline  
post #6 of 78 Old 26th October 2006, 12:15 AM
bonehead
M5 Expert (>4000)
 
bonehead's Avatar
 
Join Date: May 2006
Location: CA
Posts: 5,818
Thanks: 22
Thanked 197 Times in 135 Posts
Wow, thanks for posting the comparo vid. Really demonstrates the difference in sound. Pure evil....evil I tell you.....

Boner

bonehead is offline  
post #7 of 78 Old 26th October 2006, 01:30 AM
DaveM
Member, Sport: On DSC: On (>100 posts)
 
Join Date: Jul 2006
Location: Arizona
Posts: 128
Thanks: 0
Thanked 0 Times in 0 Posts
Wow- I really like the sound! Very professional job on the video too.

I don't have my cab yet, but do you know if the Sec. cats had to be cut out, or are they bolted in for a quick removal?
Thanks in advance
DaveM is offline  
post #8 of 78 Old 26th October 2006, 04:46 AM
a_Y
Junior Member, warming up (<31 posts)
 
Join Date: Jul 2006
Location: Toronto and Hong Kong
Posts: 28
Thanks: 0
Thanked 0 Times in 0 Posts
a_Y is offline  
post #9 of 78 Old 26th October 2006, 09:55 AM
Mark Carson
Moderator
 
Mark Carson's Avatar
 
Join Date: Feb 2005
Location: Hawaii
Age: 62
Posts: 4,513
Thanks: 1,063
Thanked 1,180 Times in 777 Posts
Rippin'

Love that sound - it rips. Nothing like the kids in their tinny wannabe rice burners and braaaap braaap fat can pipes out here. Nice to hear a real motor.

2011 Z4 3.0
2011 528i
2010 M6 Individual Coupe http://www.m5board.com/vbulletin/e63...vidual-m6.html
Mark Carson is offline  
post #10 of 78 Old 26th October 2006, 05:23 PM
Darek
Member, Sport: On DSC: On (>100 posts)
 
Darek's Avatar
 
Join Date: Nov 2005
Location: Germany
Age: 27
Posts: 149
Thanks: 0
Thanked 0 Times in 0 Posts
One question: In germany we have the exhaust fumes checked every 2 years. Don't you get into trouble if you have your secondary cat removed? You must have higher emissions in your exhaust fumes now.

But without the cat, the cars sound a lot of more aggressive. Nice job!
Darek is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
The RUF experience, with a side order of M5 (very large and loads of pics :)) Adam E39 M5 and E52 Z8 Discussion 92 22nd August 2011 08:15 PM
JOIN the Ant & Pete LIVE CHAT here!!!! Kimble Gumball 3000 Forum 16 17th May 2005 03:12 PM
Great first timer track experience fgbaloh E39 M5 and E52 Z8 Discussion 2 1st July 2004 07:18 AM
The RUF experience, with a side order of M5 (very large and loads of pics :)) Adam Porsche 911 Turbo and Porsche Panamera Forum | panameraboard.com 42 15th May 2003 07:03 PM
The RUF experience, with a side order of M5 (very large and loads of pics :)) Adam Most Memorable Threads' 30 25th April 2003 02:09 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome