Had a new exhaust system fitted about a month ago, as the old one cracked and parted between the outlet side and the middle/front box. (Octavia 1.8 TSI L&K autobox)

Checked around and found to replace was going to be about £1200 for the full section from cat joint to system, i.e. two box pieces and the connecting piping. So went to local custom shop and got a three box stainless system installed for approx £650.

Sounds very nice and significant smoothing of the engine but seems to be using about 10-15% extra fuel overall, usually got readings of 400 miles + when filling to max, but now looking at 350, do i need to get it remapped or reset the ecu etc.     

Did they replace the catastrophic convertor?

 

Aftermarket ones can be very restrictive and also have barely enough precious metals to pass an initial MOT.

 

Can you explain exactly what section(s) was/were replaced, "from the cat joint to system" is confusing to me.

 

I would also check that the Lambda sensor is swinging hi and lo around the 1.0v reference voltage at idle and higher revs, you will need a moving scale meter to do this.

1 hour ago, J.R. said:

Did they replace the catastrophic convertor?

 

Aftermarket ones can be very restrictive and also have barely enough precious metals to pass an initial MOT.

 

Can you explain exactly what section(s) was/were replaced, "from the cat joint to system" is confusing to me.

 

I would also check that the Lambda sensor is swinging hi and lo around the 1.0v reference voltage at idle and higher revs, you will need a moving scale meter to do this.

The catalytic converter was not replaced, the joint between the cc and the end of the exhaust is one section, and had to be completely replaced as the exit pipe from the first box had parted company from the first box, and was not suitable for a repair.

Therefore the whole section first and rear box had to be replaced with new items, the first box section was available at £700 pounds but no rear box was available for 6 months with a new MOT due next month.