Octavia III Exhaust Thread

[99Reza]

I'm actually interested on what can cause the stalling issue.

I'm experiencing something similar (not stalling, yet) eversince I picked the car up. After cold start the engine runs a bit rough and whenever I stab the throttle and let it go quickly the rpm will drop below the idling rpm and stutter lightly, quite apparent at night as the interior light flickers in sync with the stuttering. The roughness and stuttering tend to dissapear after the engine has fully warmed up and whenever the aircon is running.
Mentioned this to the service centre and what they did is just re-flash the ecu, but it's still there.

[99Reza]

Made some recording earlier today to give an idea of what the sound is like.

Skoda OEM Exhaust with Aftermarket Resonator - YouTube

The resi has gotten slightly louder, I'm liking it. Sound very sporty when driving the car spiritedly.

[Fireside]

I'm actually interested on what can cause the stalling issue.

I'm experiencing something similar (not stalling, yet) eversince I picked the car up. After cold start the engine runs a bit rough and whenever I stab the throttle and let it go quickly the rpm will drop below the idling rpm and stutter lightly, quite apparent at night as the interior light flickers in sync with the stuttering. The roughness and stuttering tend to dissapear after the engine has fully warmed up and whenever the aircon is running.
Mentioned this to the service centre and what they did is just re-flash the ecu, but it's still there.

I don't know 100% that it was the pipe size that caused the stalling, but it was defiantly the Miltech 3" exhaust coupled with the setup that caused these problems.
Blufrog had an almost identical setup to me but with a 2.75" and he never had an issue (neither has anyone else that I know of)...

But I'd be interested to know if anyone has had probs with the 3" exhausts?

I was also told by the installers that it was almost certainly to do with pressure against the sensors or something (the tune should have been cancelling it out).

But now that the exhaust is off, it's gone from stalling almost once a week, to not at all!
Nothing else has changed other than the suspension removal.

So you can see why I'd be a bit hesitant to go with the same setup as last time.


On another note, I'm looking at the APR turbo Muffler Delete tho... Sounds nice, throaty! Couple that with a hotdoggy and we'll be in business!
Anyone know if it adds killerwasps? Must be better flow at least?

[Dzl_Dubba]

Probably nothing significant but more noise definitely.

[99Reza]

That turbo muffler delete mod looks interesting, not that expensive either. I'm curious to hear how it will sound with non-OEM exhaust setup.

[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]

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".