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Emissions with downpipe


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#1
Quattro

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Probably too much time on my hands on a Saturday night but I’d really appreciate any help on this.
As always I’m always thinking should I upgrade my car to stage 2 pfl.
Lots of exhaust manufacturers only list a decat downpipe and what looks like a sports secondary catalyst.
So my question has anyone fitted a decat downpipe but left their secondary cats in place?
If so does the car pass an emissions test with only secondary cats fitted?

#2
0120raptor

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Probably too much time on my hands on a Saturday night but I’d really appreciate any help on this.
As always I’m always thinking should I upgrade my car to stage 2 pfl.
Lots of exhaust manufacturers only list a decat downpipe and what looks like a sports secondary catalyst.
So my question has anyone fitted a decat downpipe but left their secondary cats in place?
If so does the car pass an emissions test with only secondary cats fitted?

Car passes MOT easily with decat downpipe only but not with decat downpipe AND secondary decats. .  


Catalunya Red ,Heated rear window,Power steering,Wireless (with FM),Seat belts,Servo assisted brakes.Pneumatic tyres. Disc brakes.


#3
Quattro

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Car passes MOT easily with decat downpipe only but not with decat downpipe AND secondary decats. .

Thanks for your helpful info as usual
Now just need to decide if it’s worth going stage 2 over my current stage 1

Edited by Quattro, 13 April 2019 - 07:56 PM.


#4
RS3Dell

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Mine also passes its mot with a decatted down pipe & the 2nd cats refitted.

HC 100 limit 200 as above.

HC 4 limit 200 at 1st mot 😂

Dell.
RS3 8P 2012 Phantom Black, Bucket Seats,Optic Black Pack, MRC Stage 2,+ DSG Remap, Forge Intercooler, Autotech HPFP, HG Motorsport Intake Pipe, Pipercross Airfilter,Powerflex Gearbox & Dog Bone Mount Inserts, Fully Decatted OEM Exhaust, 443Ps 777Nm,Reyland 2 piece Discs & DS2500s All Round,Bilstein B14, 034 ARB.MPS4s,VCDs User.

#5
Lawrence

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The second cats are easily put back on although my bolts snapped on my cats when removing crazy on a 2 year old car so have replaced them with stainless studs and nuts if I choose to refit them

Edited by Lawrence, 13 April 2019 - 08:19 PM.


#6
RS3Dell

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The second cats are easily put back on although my bolts snapped on my cats when removing crazy on a 2 year old car so have replaced them with stainless studs and nuts if I choose to refit them


Im running a set of oem gutted 2nd cats fitted with stainless steel nuts/bolts so easy to remove & refit the oem 2nd cats at mot time.

Dell.
RS3 8P 2012 Phantom Black, Bucket Seats,Optic Black Pack, MRC Stage 2,+ DSG Remap, Forge Intercooler, Autotech HPFP, HG Motorsport Intake Pipe, Pipercross Airfilter,Powerflex Gearbox & Dog Bone Mount Inserts, Fully Decatted OEM Exhaust, 443Ps 777Nm,Reyland 2 piece Discs & DS2500s All Round,Bilstein B14, 034 ARB.MPS4s,VCDs User.

#7
Lawrence

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You wonder what rubbish these parts are made from nowadays on a premium brand car. Not just my car but motors in general now 3 years old they look buggered underneath

#8
RS3Dell

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You wonder what rubbish these parts are made from nowadays on a premium brand car. Not just my car but motors in general now 3 years old they look buggered underneath

 

Yep & the cat pipe studs facing forward don't help much tbh. :(

 

Dell.


RS3 8P 2012 Phantom Black, Bucket Seats,Optic Black Pack, MRC Stage 2,+ DSG Remap, Forge Intercooler, Autotech HPFP, HG Motorsport Intake Pipe, Pipercross Airfilter,Powerflex Gearbox & Dog Bone Mount Inserts, Fully Decatted OEM Exhaust, 443Ps 777Nm,Reyland 2 piece Discs & DS2500s All Round,Bilstein B14, 034 ARB.MPS4s,VCDs User.

#9
RS3Dell

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The second cats are easily put back on although my bolts snapped on my cats when removing crazy on a 2 year old car so have replaced them with stainless studs and nuts if I choose to refit them

 

On both sets of cats 1 or 2 of the studs broke when removing them,i got all of them remove & refitted new studs to the pipes i'm keep for mot time & for when i sell the RS.

 

The gutted set i drill out the stud threads so i could use stainless steel nuts/bolts as they were going to be fitted to the RS 99.9% of the time.

 

Dell.


Edited by RS3Dell, 13 April 2019 - 10:12 PM.

RS3 8P 2012 Phantom Black, Bucket Seats,Optic Black Pack, MRC Stage 2,+ DSG Remap, Forge Intercooler, Autotech HPFP, HG Motorsport Intake Pipe, Pipercross Airfilter,Powerflex Gearbox & Dog Bone Mount Inserts, Fully Decatted OEM Exhaust, 443Ps 777Nm,Reyland 2 piece Discs & DS2500s All Round,Bilstein B14, 034 ARB.MPS4s,VCDs User.

#10
Huwgo R

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Hi Quattro
I went straight stage2 and boy am i a very happy man everytime you just boot it it makes me smile with the performance and the noise

Just go for it you wont regret it



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