legal? moral? worth it

Rikki · 22nd May 2017, 19:54

dropped my mate of to pick his car up from the local (well known and respected) performance car workshop.. and all them came out, their specialisation is exhausts- , now my dilemma is they have never built a ZT exhaust-so they have offered me a full decat (leaving the cat housing in place) and a "hollow" back box- replacing all the rest with Stainless - for the princely sum of £180- question is - is it legal? will it affect the emissions- anything else I should consider before thinking about it?

keithst24 · 22nd May 2017, 19:56

Not sure of its legality but it is cheap.....my Powerflow Cat back was over £400

Sector-9 · 22nd May 2017, 20:03

I think you could fail the MOT if a cat was originally fitted and is clearly missing (though from the sound of it, you'd still have the appearance of the cat with the new system) so it all boils down to whether you can pass the emissions test without it. On a diesel this is easy as they don't test the exhaust gas composition, just opacity, but I think you'd struggle to get a petrol through without a functioning cat in place.

Having said that, cats get very hot and along with the front pipe, are probably the hottest part of the exhaust system so don't tend to rot out very quickly, unlike the (much cooler) rear and mid sections. A stainless system from the cat to the rear would probably be cheaper and no legal worries. Not sure if you'd need to tell insurance or not though.

Mickyboy · 22nd May 2017, 20:16

Should be fine MOT check is visual check for a cat, so no probs there👍

Freebyrd · 22nd May 2017, 20:16

Best ask at your local MOT station, they should know.

trikey · 22nd May 2017, 20:19

Youll get an engine management light on the petrols due to the lambda sensors getting false readings, diesels are fine with a decat.

Fusilier · 22nd May 2017, 20:25

Rikki

It will also be very loud, and may exceed the noise levels with the empty back box. You are better off getting a backbox with the baffles in, and also has Andy has mentioned will get EML on

Stu

Rick-sta · 22nd May 2017, 22:57

You will fail your mot on emissions . Diesels get away with decats as theres no emissions test just a visual one, going by your profile yours is a 190 so a decat will fail your next mot.

coab · 23rd May 2017, 10:50

Quote:

Originally Posted by trikey

Youll get an engine management light on the petrols due to the lambda sensors getting false readings, diesels are fine with a decat.

You can buy an adapter on eBay that screws into your exhaust then you screw the lambda sensor in on top. It moves the sensor far enough so the light stays out so I'm told.

suzublu · 23rd May 2017, 10:53

Quote:

Originally Posted by coab

You can buy an adapter on eBay that screws into your exhaust then you screw the lambda sensor in on top. It moves the sensor far enough so the light stays out so I'm told.

It does

I had one, looks like the base part of a spark plug, just screws in then fit the sensor to it

22nd May 2017, 19:54	#1
Rikki Loves to post MG ZT+ 190, Land Rover Series IIA, KIA Pro C'eed VR7 Join Date: Apr 2017 Location: Redcar Posts: 258 Thanks: 151 Thanked 158 Times in 53 Posts	legal? moral? worth it dropped my mate of to pick his car up from the local (well known and respected) performance car workshop.. and all them came out, their specialisation is exhausts- , now my dilemma is they have never built a ZT exhaust-so they have offered me a full decat (leaving the cat housing in place) and a "hollow" back box- replacing all the rest with Stainless - for the princely sum of £180- question is - is it legal? will it affect the emissions- anything else I should consider before thinking about it? __________________ [SIGPIC][/SIGPIC] *GREYSCALE* Born Monday, 14th July 2003 @ 12:51:51 9,940th ZT to run off the production line, out of 18,894 2,948th ZT 190 + to be made out of 4,023 1,042nd ZT in XPower Grey (code: LEF) to be made out of 3,143 XPower Grey ZTs Done: Cam belt and aux belts. Water pump, pulleys and tensioners, Hunter wheel alignment, New thermostat and housing, Plenum guard mod, refix undertray, Bonnet cable mod, upgraded Balance VIS motor, One empty bank account, one nervous breakdown.

22nd May 2017, 19:56	#2
keithst24 This is my second home X Power Grey MGZT 180+ Auto... Bumble & 1.8T Odessey Rover 75 Contemporary SE manual Join Date: Nov 2015 Location: Reigate Posts: 5,375 Thanks: 2,254 Thanked 1,801 Times in 1,403 Posts	Not sure of its legality but it is cheap.....my Powerflow Cat back was over £400 __________________ [SIGPIC][/SIGPIC] Bumble Membership Number 35478 Born Monday, 16th June 2003 @ 14:30:35 This vehicle was the 9,196th ZT to run off the production line, out of 18,894 This vehicle was the 576th ZT 180 + to be made out of 828 This vehicle was the 871st ZT in XPower Grey (code: LEF) to be made out of 3,143 XPower Grey ZTs

22nd May 2017, 20:03	#3
Sector-9 Gets stuck in Rover 75 CDT manual Tourer Join Date: Aug 2014 Location: nr. Mansfield Posts: 767 Thanks: 24 Thanked 182 Times in 137 Posts	I think you could fail the MOT if a cat was originally fitted and is clearly missing (though from the sound of it, you'd still have the appearance of the cat with the new system) so it all boils down to whether you can pass the emissions test without it. On a diesel this is easy as they don't test the exhaust gas composition, just opacity, but I think you'd struggle to get a petrol through without a functioning cat in place. Having said that, cats get very hot and along with the front pipe, are probably the hottest part of the exhaust system so don't tend to rot out very quickly, unlike the (much cooler) rear and mid sections. A stainless system from the cat to the rear would probably be cheaper and no legal worries. Not sure if you'd need to tell insurance or not though. __________________ Free fault codes scan/clear (TOAF) - M1 J27 area

22nd May 2017, 20:16	#4
Mickyboy SERVICING AND DEALER DIAGNOSTICS MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW Join Date: Aug 2013 Location: Hernebay Posts: 4,331 Thanks: 818 Thanked 2,414 Times in 1,141 Posts	Should be fine MOT check is visual check for a cat, so no probs there👍 __________________ [SIGPIC][/SIGPIC] T4 Owner Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings. Jobs to do: ,replace drivers lock,.[/SIZE]

22nd May 2017, 20:16	#5
Freebyrd Posted a thing or two MG ZT-T Join Date: May 2010 Location: Edinburgh Posts: 1,667 Thanks: 992 Thanked 384 Times in 277 Posts	Best ask at your local MOT station, they should know. __________________ MG ZT-T 180+Sports Auto Date of Birth: 21 May 2002

22nd May 2017, 20:19	#6
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Youll get an engine management light on the petrols due to the lambda sensors getting false readings, diesels are fine with a decat. __________________ Lest we forget..

22nd May 2017, 20:25	#7
Fusilier Moderator / RS North East MG ZT T 180,MGF Freestyle, Jaguar XKR Convertible and XF Join Date: Jan 2008 Location: Newton Aycliffe Posts: 6,397 Thanks: 1,329 Thanked 2,231 Times in 1,309 Posts	Legal Rikki It will also be very loud, and may exceed the noise levels with the empty back box. You are better off getting a backbox with the baffles in, and also has Andy has mentioned will get EML on Stu __________________ # Project Gruple http://www.the75andztclub.co.uk/foru...d.php?t=213155

22nd May 2017, 22:57	#8
Rick-sta This is my second home MG ZT 2.0 CDTI+ in Typhoon, MG TF 135 in Typhoon & Rover 75 Connoisseur CDTI SE in Pearl Black Join Date: Oct 2012 Location: Norfolk Posts: 7,534 Thanks: 2,718 Thanked 2,827 Times in 1,462 Posts	You will fail your mot on emissions . Diesels get away with decats as theres no emissions test just a visual one, going by your profile yours is a 190 so a decat will fail your next mot. __________________ How to retrofit Cruise Control on a diesel with no OEM wiring in place: Link How to retrofit heated electric memory seats with no OEM wiring in place: Link How to operate FBH and ATC via text Link How to restore cloudy projector headlights Link