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Re: Wrapped headers, removed cats and exhaust baffles [Re: Mol] #269612
23/04/15 04:45 PM
23/04/15 04:45 PM
Joined: Oct 2012
Posts: 2,154
Furry Boots City
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Good write up - hadn't thought of tying off the wrap and winding the header towards it. It's amazing just how easy it is to take off and replace the headers after you've done it for the first time though.
As for the cats; I'll be leaving mine in but if I manage to acquire a set of headers that don't have them so that there can be an annual swap for the MOT then...

Re: Wrapped headers, removed cats and exhaust baffles [Re: Mol] #370729
14/06/16 01:59 PM
14/06/16 01:59 PM
Joined: Jul 2015
Posts: 2,505
Detroit, Michigan, USA
Draggin Offline
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Hypothetically i wonder what size hole saws?


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2016 M3W John A Prestwich Special

1968 Honda CL175,and 2012 Enfield for sale






Re: Wrapped headers, removed cats and exhaust baffles [Re: Mol] #370750
14/06/16 03:14 PM
14/06/16 03:14 PM
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Baltimore, Maryland USA
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KenShapiro Offline
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Baltimore, Maryland USA
Done quite a few wraps. Never heard of or considered removing the headers to accomplish it.


The Original Ken
10,000 miles.

2014 BMW R9T
2005 Saabaru
2005 Saabaru
Re: Wrapped headers, removed cats and exhaust baffles [Re: KenShapiro] #370764
14/06/16 04:04 PM
14/06/16 04:04 PM
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Detroit, Michigan, USA
Draggin Offline
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Originally Posted By KenShapiro
Done quite a few wraps. Never heard of or considered removing the headers to accomplish it.

I think they were off to pull the cats, and once off, why not wrap them without the suspension in the way?


kirkusblog.com
2016 M3W John A Prestwich Special

1968 Honda CL175,and 2012 Enfield for sale






Re: Wrapped headers, removed cats and exhaust baffles [Re: PaulJ] #370775
14/06/16 04:44 PM
14/06/16 04:44 PM
Joined: Jul 2013
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West Sussex, UK
Chris99 Online content
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Originally Posted By PaulJ
As a matter of interest, as one or two people have commented, once our cars are three years old, they have to have an annual inspection, which includes a strict emissions test. However, once the test is completed, it is very unlikely that the car will get pulled over for another 12 months, and if the owner has substituted a cat. free pipe, no one would know!


Great post and the dragon looks an awesome bit of road.

For info, a 3 wheeler does not require a UK MOT emissions test - confirmed by Andymot (our "tame" MOT tester) with a link to the MOT regulations in another thread.





Red Leader drive
Re: Wrapped headers, removed cats and exhaust baffles [Re: Draggin] #370813
14/06/16 07:21 PM
14/06/16 07:21 PM
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KenShapiro Offline
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Originally Posted By Draggin
Originally Posted By KenShapiro
Done quite a few wraps. Never heard of or considered removing the headers to accomplish it.

I think they were off to pull the cats, and once off, why not wrap them without the suspension in the way?


I would agree but that's not what he said.


The Original Ken
10,000 miles.

2014 BMW R9T
2005 Saabaru
2005 Saabaru
Re: Wrapped headers, removed cats and exhaust baffles [Re: Mol] #557012
31/01/19 05:58 PM
31/01/19 05:58 PM
Joined: Nov 2018
Posts: 179
CT, USA
0
06032 Offline
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CT, USA
I realize this is an old thread. But I'm curious if removal of the cats and baffles plus the addition of a less restrictive intake, a) essentially results in a 'MMC Stage 1' upgrade, b) if it requires an ECU tune or does the (US-spec) ECU have enough bandwidth to adapt, and c) if a G56 Stage 2 upgrade that includes an ECU tune would be happy layering on top of the 'homemade' Stage 1.

Asked another way, would this mod save the cost of a Stage 1, particularly if the goal is Stage 2 anyway?


'17 M3W
'08 Ural Gear Up
Re: Wrapped headers, removed cats and exhaust baffles [Re: Mol] #557120
01/02/19 10:08 AM
01/02/19 10:08 AM
Joined: Mar 2015
Posts: 738
London uk
rockabilly john Online happy
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Don't you need the Cam upgrade to accomplish this?

Re: Wrapped headers, removed cats and exhaust baffles [Re: rockabilly john] #557166
01/02/19 12:48 PM
01/02/19 12:48 PM
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West Sussex, UK
Chris99 Online content
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West Sussex, UK
There's a bit of inconsistency in the stages depending on whether you are talking MMC, G56 or Krazy Horse. Basically the standard ECU should be OK until you upgrade to the 569 cams.

MMC/G56:

Stage 1: Exhaust and air filter, fine with standard ECU
Stage 2: Add upgraded cams and ECU

KH:

Stage 1: Exhaust and air filter, retain standard ECU
Stage 2: Add ECU and dyno tune
Stage 3: Add cams and dyno tune
Stage 4: Add 128ci big bore kit, roller rockers, ported cylinder head, throttle bodies, high flow injectors and dyno tune


Red Leader drive
Re: Wrapped headers, removed cats and exhaust baffles [Re: rockabilly john] #557182
01/02/19 01:26 PM
01/02/19 01:26 PM
Joined: Nov 2018
Posts: 179
CT, USA
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Originally Posted By rockabilly john
Don't you need the Cam upgrade to accomplish this?
Originally Posted By rockabilly john
Don't you need the Cam upgrade to accomplish this?


Correct. Which includes an ECU reflashed for the cams, so wouldn't it assume the engine is breathing better too and factor that increased air flow into its equation?

So if the goal is Stage 2, why not just help the engine breath better on your own? If the noise proves unacceptable, buy a set of Stage 1 pipes. Does this make sense? I'm trying to figure out why a MMC Stage 1 is worth $2k.....


'17 M3W
'08 Ural Gear Up
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