pstock
Active Member
Had my CL500 for 6 years secondary cats removed never came close to failing on emissions which is what my local garage goes by.
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Just to clarity for an ignoramus like me what are the secondary cats replaced with? X pipe? I just can`t get used to the quietness
Looks like my reading are a bit higher than yours but passed anyway. MOT this morning.
Been intending to get the resonator replaced with straight pipes for years but now thinking a hidden gutting of the secondaries instead would be a better route.
It is illegal. Fortunately, my MOT tester is only interested in the emissions of the car and has passed it 3 years running without secondary cats.:bannana:
You're MOT tester is only interested in the check he has to conduct in order pass or fail your car.
At the risk of doing him a disservice, he most likely has no actual knowledge of vehicle emissions, how they are produced in the engine, how they are managed by the exhaust after treatment system(s) or how they are measured in order to comply with prevailing regulation. He is certainly not equipped to carry out an emissions test, nor is he required to of course.
The MOT check doesn't even come close to a meaningful exhaust emissions test. That your car passes the MOT without secondary cats, fully illustrates the inadequacy of the method.
You're MOT tester is only interested in the check he has to conduct in order pass or fail your car.
At the risk of doing him a disservice, he most likely has no actual knowledge of vehicle emissions, how they are produced in the engine, how they are managed by the exhaust after treatment system(s) or how they are measured in order to comply with prevailing regulation. He is certainly not equipped to carry out an emissions test, nor is he required to of course.
The MOT check doesn't even come close to a meaningful exhaust emissions test. That your car passes the MOT without secondary cats, fully illustrates the inadequacy of the method.
Post #20 2nd image. Why would an MOT tester need any knowledge of vehicle emissions. He only has to hook the car up to a diagnostic machine which measures all the necessary emissions. Hardly his fault if the MOT test regulations don't meet the standard you feel they should. Mine passed, end of story.
If I thought I could get away with it, the primaries would go too and long tube headers would give me another 40+bhp.
^ I re read your post and I'm not sure quite what point you are trying to make?
The car passed all the tests within the set parameters. As to whether the MOT comes close to a meaningful emissions test is neither here nor there currently.
As a diesel owner I think perhaps you should be more worried about emissions.
I would do both. Your CLS would sound great having less silencing in the rear mufflers to my E55.
If your car has no secondary cats, the reality is it releases more CO, HC, NOx and Particulates at the tailpipe than my diesel.
Phew! That's some heavy philosophical sh8t right there...but true.When science and medicine solves all the things that kill us...what will we die of?
Serious question....the biggest problem facing the world is exponential population growth...yet everyone wants fewer people to die.
I've had the secondary cats removed with the X pipe installed and the SL55 passed the MOT last week. No issues from my side.
Well, having spent more than 25-years in fuels R&D that included conducting full blown emissions testing on climate controlled chassis dynamometer systems with million dollar CVS emissions suites and having also conducted on-road and on highway emissions tests and bench tests on vehicles and engines from all of the major manufacturers, I could give you some numbers. But I'm not going to, you probably wouldn't believe me anyway.I'm interested now. Do you make that assertion on the basis of particular research or evidence, or merely because your car meets the Euro 6 diesel standard? Go on; give us some numbers...
When science and medicine solves all the things that kill us...what will we die of?
Well, having spent more than 25-years in fuels R&D that included conducting full blown emissions testing on climate controlled chassis dynamometer systems with million dollar CVS emissions suites and having also conducted on-road and on highway emissions tests and bench tests on vehicles and engines from all of the major manufacturers, I could give you some numbers. But I'm not going to, you probably wouldn't believe me anyway.
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