Hi all,
Has anyone taken out the catalytic converter on the 3.0d? I'm looking at ideas to improve performance on my E53 but I'm not looking at spending huge amounts or upgrading to a V8 petrol model. A remap looks like the best option for money vs gains, I didn't know whether to couple this with a decat and there are any issues with engine management if this is removed, with exhausts in mind I was also looking at fitting less restrictive muffler back boxes also. I wouldn't be looking for more noise just something a little more free flowing.
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Decat and remap E53 (2004) 3.0d sport
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Edward R-W
- Newbie
- Posts: 18
- Joined: Mon Oct 15, 2018 8:29 am
- Location: Welwyn Garden
Decat and remap E53 (2004) 3.0d sport
Edd
2004 3.0d 218bhp E53 X5, Black, Cream Leather Interior.
2004 3.0d 218bhp E53 X5, Black, Cream Leather Interior.
Re: Decat and remap E53 (2004) 3.0d sport
Not specific to the E53, but my E46 330d was (allegedly, he had no documentary proof) remapped for the previous owner. The swirl flaps were definitely blanked by the time I bought it.
I deleted the EGR and the cat. The cat delete was a stainless pipe from a firm in Glasgow, but I can't remember the name now.
That car was not only quick when you wanted it to be, but over the course of 50+k miles it averaged 40+mpg and it never got anywhere near failing the MOT on emissions.
I deleted the EGR and the cat. The cat delete was a stainless pipe from a firm in Glasgow, but I can't remember the name now.
That car was not only quick when you wanted it to be, but over the course of 50+k miles it averaged 40+mpg and it never got anywhere near failing the MOT on emissions.
October 2012 build X3 30d SE, Bluewater. Now with Webasto sunroof and paddle-shift 
Re: Decat and remap E53 (2004) 3.0d sport
Just to be aware of.....
https://www.gov.uk/government/publicati ... plications.
Is it really worth it?
https://www.gov.uk/government/publicati ... plications.
Is it really worth it?
Never anthropomorphise computers. They hate that.Re: Decat and remap E53 (2004) 3.0d sport
Checks on de-cats and DPF have got more vigorous.
I know people sometimes rip the internals out to leave the cat and DPF itself so it doesn't look any different, but I have also heard stories of MOT tapping the cat / DPF with a screwdriver to see if they sound hollow and then reacting accordingly if they believe it has been tampered with.
I know people sometimes rip the internals out to leave the cat and DPF itself so it doesn't look any different, but I have also heard stories of MOT tapping the cat / DPF with a screwdriver to see if they sound hollow and then reacting accordingly if they believe it has been tampered with.
Current
2011 E70 40d 7 seat - remapped
Merc CLK convertible
Audi A2
Smart Car
Previous BMW
E32 - 735se, 735il
E39 - 530d touring
E61 - 525i touring, 525d touring (remapped)
2011 E70 40d 7 seat - remapped
Merc CLK convertible
Audi A2
Smart Car
Previous BMW
E32 - 735se, 735il
E39 - 530d touring
E61 - 525i touring, 525d touring (remapped)
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Edward R-W
- Newbie
- Posts: 18
- Joined: Mon Oct 15, 2018 8:29 am
- Location: Welwyn Garden
Re: Decat and remap E53 (2004) 3.0d sport
I would keep the original system and place it back on the car for the mot test and any new system would be a stealth version meaning it would be hidden out of sight from the rear of the car behind the bumper so it wouldn't draw attention.
The 'legal' stuff doesn't bother me, even remapping your car voids your insurance unless declared.
I'm more interested to know if anyone has done a decat and had any problems, can it be done easily, does it affect the engine management/lumpy running etc, does it churn out more soot from the exhaust, does it pass an mot with no cat etc . . . ?
The 'legal' stuff doesn't bother me, even remapping your car voids your insurance unless declared.
I'm more interested to know if anyone has done a decat and had any problems, can it be done easily, does it affect the engine management/lumpy running etc, does it churn out more soot from the exhaust, does it pass an mot with no cat etc . . . ?