Octavia III Exhaust Thread

[mazstar1980]

I've started looking for exhausts and noticed this thread, would a catback system cause engine or ECU problems?

[99Reza]

It shouldn't. Changing the downpipe on the other hand will require a tune or spacer for the O2 sensor.

Which catback system are you looking at?

[mazstar1980]

It shouldn't. Changing the downpipe on the other hand will require a tune or spacer for the O2 sensor.

Which catback system are you looking at?

I've asked for quotes from Milltek dealers, Fox and I'm going to look into Bull-X.

I got a quote from Remus Aus which was $2700 excluding install - very expensive even if that is the gold standard with the remote valves, lovely noise. Super sprint looks and sounds good but again it would be about $3k.

EDIT: Fox is about $1300 but they have no dealers in Aus and shipping would be 700 Euro - they were keen to explore other methods as they wanted to have their first Skoda exhaust in Australia. Theirs is 2.5 I think and sounded good.

UPDATE: Milltek is going to be $3k installed $2.8k of which is parts - way too much, prefer the Remus at that price.

Bull-X is about $1400 delivered, I'll need to find a place to install but I think should be able to for under $2k all up.

I would prefer 2.5 but they all seem to be 3 inch - is there any issue with back pressure or losing power etc with catbacks? I've read forums saying it will only change the noise.

[Lucas_R]

Octavia III Exhaust Thread

The standard exhaust is 2.4" so you would want 2.75" - 3.00" if you were going to the expense of changing it for an aftermarket system.

A catback system is all about noise, there may be a very small increase in power (a few hp perhaps) but you would never notice it.

Turbocharged engines don't require back pressure in the same way that a naturally aspirated car does. You will find that 98% of aftermarket exhausts for your car will be 3" with the occasional company offering 2.5" or 2.75".