All Things Mk5 > Performance Modifications
Pre Cat removal
the bruce:
The advantages are well known. Worthwile mod for remapped engines.
The disadvantages:
- ''smell'' when engine is cold
- louder noise, (very little) drone
- one hour of work (+ risk of braking bolts)
- illegal
I placed the DP upside down to prevent dirt polluting the (main) cat.
Then I used hammer and chissel and at least a steel brush.
TAKE CARE NOT TO DAMAGE THE OXYGEN SENSOR (or remove it) !!
I used new seal and nuts.
Weston:
How would this compare to a full decat?
JMP:
--- Quote from: the bruce on September 21, 2011, 10:20:02 pm ---The advantages are well known. Worthwile mod for remapped engines.
The disadvantages:
- ''smell'' when engine is cold
- louder noise, (very little) drone
- one hour of work (+ risk of braking bolts)
- illegal
--- End quote ---
Has anyone actually broken bolts (or nuts) when taking the downpipe off? I picked up a couple of rust penetrating sprays yesterday to ease those.
vRS_Pagey:
--- Quote from: the bruce on September 21, 2011, 10:20:02 pm ---The advantages are well known. Worthwile mod for remapped engines.
The disadvantages:
- ''smell'' when engine is cold
- louder noise, (very little) drone
- one hour of work (+ risk of braking bolts)
- illegal
I placed the DP upside down to prevent dirt polluting the (main) cat.
Then I used hammer and chissel and at least a steel brush.
TAKE CARE NOT TO DAMAGE THE OXYGEN SENSOR (or remove it) !!
I used new seal and nuts.
--- End quote ---
Is it? Cold start emissions testing is not currently part of the UK MOT test......
@JMP - Also have a look here - http://briskoda.net/forums/topic/197778-pre-cat-removed/ :happy2:
Tfsi_Mike:
--- Quote from: Bogwoppit on August 21, 2010, 08:36:08 am ---I have now been running without a pre-cat for 2 weeks (on the standard map) and the car runs fine without any engine lights. The EPC light I mentioned above was for something else and was totally unrelated to the pre-cat removal.
It's difficult for me to say if I have noticed any difference in performance due to the pre-cat as I fitted a Neuspeed intake, SFS Intercooler hoses and a rev d diverter valve at the same time as removing the pre-cat.
The car definitely feels perkier and sounds better after carrying out those mods though :evilgrin:
--- End quote ---
Made the mistake I do every time. Want to feel the difference of a specific mod but do them in bulk every time as it's usually more cost effective
Would certainly imagine removing the pre cat played a part in the improvement felt. Car's not ussually MOTd at cold start anyway :smiley:
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