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When i replaced the oem catalysts,i requested 2 200cci cats from BN pipes.Im thinking...is it possible to change the system from 2 to one by only using one of them with the correct tubing of course,or will i have to get a new cat done as it will fail the emissions test?
well i dont know,most people are using only 1 cat instead of 2 for less restriction.When you get only 1 cat,does that mean that it is manufactured in a different way to be wider??
I was thinking of this as part of my lower downpipe which is the original part actually that connects to the 2 cats,has begun deteriorating so in case it develops a hole,i was thinking of getting rid of one cat,stay with one and probably have less backpressure
I was told on a 3b that you could easily run a 100cell and it should pass the basic emissions check. I am planning on replacing the restrictive Y section off the bottom of the downpipe out to 2 cats to just a straight pipe with one inline 100cell cat.
it is most likely that 1 cat can do the job.what i have heard though is that they use more chemical material when you use 1 cat in order to pass emmisions.This is why im wondering if my 2 cats can be cut to 1 or not.
Of course if that would be able to happen i would have to have the car modified to be connected to a larger tube as it's tubing is down to 60mm since there are 2 of them.The cat itself is of course larger,about 76 or 80mm in diameter.i dont know what can be done,i only think that it would be a pity to throw them away since they are practically new.Unless i could resell them again.
used to be the case that Audi would buy them back (to recover the platinum I guess ) and at one point they paid good money i heard - I guess that activity has long since stopped
well back home i do have the original cats as well as the catback system.Cats seem OK only done 120K kms and greek MOT requires you to replace them after those Kms.
I also wrote to BN pipes about this and if it can be done.If i can get away with 1 200cpi cat and 76mmdownpipe all the way to the cat that would be nice.Then i can just see if i can make all the system 76mm rather than 70mm catback that i have.(at least im told that the silencers are 76mm internally so i will be keeping them
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) and at one point they paid good money i heard - I guess that activity has long since stopped 
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