25th October 2006, 21:02
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#1
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m5board.comoholic (>1000 posts)
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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.
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25th October 2006, 21:08
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#2
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Member, Sport: On DSC: Off
Join Date: Jan 2006
Location: Baton Rouge, LA, USA
Age: 74
Garage:
2006 Silver BMW M6
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Thanked 14 Times in 8 Posts
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????????????????????????????????????
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
'09 911S
'05 MINI Cooper S Convert
'09 Hyundai Genesis V8
PREVIOUS:'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
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25th October 2006, 21:33
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#3
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m5board.comoholic (>1000 posts)
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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.
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25th October 2006, 22:20
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#4
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Member, Sport: On DSC: On (>100 posts)
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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)??
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26th October 2006, 00:15
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#6
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M5 Expert (>4000)
Join Date: May 2006
Location: CA
Garage:
Somethin' German
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Thanked 195 Times in 133 Posts
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Wow, thanks for posting the comparo vid. Really demonstrates the difference in sound. Pure evil....evil I tell you.....
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26th October 2006, 01:30
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#7
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Member, Sport: On DSC: On (>100 posts)
Join Date: Jul 2006
Location: Arizona
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745
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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
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26th October 2006, 04:46
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#8
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Junior Member, warming up (<31 posts)
Join Date: Jul 2006
Location: Toronto and Hong Kong
Garage:
CB e46 M3
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That sounds godly.... Loving the sound of your car! Wish I had one!
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26th October 2006, 09:55
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#9
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Moderator
Join Date: Feb 2005
Location: Hawaii
Age: 60
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Cold beer
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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.
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26th October 2006, 17:23
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#10
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Member, Sport: On DSC: On (>100 posts)
Join Date: Nov 2005
Location: Germany
Age: 25
Garage:
E36 328i, blue
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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!
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