NCT and straight through exhaust?

kapisko1PL · 13-08-2014 7:58pm #1

Just like in the title.

I just bought the car (used) and it failed NCT when the old owner was trying to put it through. Reasons: Exhaust System Noise - Silencer - Missing. It is also leaking a little which is easy to fix.

Can a car with a straight through exhaust pass the NCT nowadays or did something change since I remember people saying that it can...

Is is a Seat Toledo 1.9TDI

stimpson · 13-08-2014 8:02pm

Pre 92 didn't need a cat. Silencer is needed to keep noise below 100db (I think)

Edit: 99db is the limit (measured from 1 metre)

mphalo1 · 13-08-2014 8:04pm

no it wont pass!! everyone that has a straight through exhaust always has the original at home to bolt on for nct so you may go to a breakers and pick one up

stimpson · 13-08-2014 8:13pm

I had a straight through decatted exhaust with a bung to keep the noise down. It was rated at 98db. Passed every time.

pablo128 · 13-08-2014 10:05pm

Diesels that are running well will pass an nct without a cat. If it has pigeon sh1te welding on the replacement pipe that's also leaking, I can imagine it would be mentioned on the fail sheet alright. A leaking exhaust will definitely fail.

kapisko1PL · 13-08-2014 10:57pm

The diesel is great but the pipe is a bit damaged (welding, o-ring or something like that) and I am going to fix it this week. To me it is not bad but you can hear the hole in the exhaust.

mphalo1 · 13-08-2014 11:03pm

so your saying they failed it on the hole in the exhaust not the fact its a straight through ? I'd of thought it would fail on emissions and noise but probably not noise as its a diesel

kapisko1PL · 13-08-2014 11:07pm

You see, the old owner put it through and it failed on the noise and it said the silencer was missing but it is probably it is too loud because the pipe disconected at some point. I just want to know if someone has a straight through exhaust and ever had any problems doing the NCT?

pablo128 · 13-08-2014 11:19pm

Failing the test because of a hole would be more from a safety point of view. At a standstill there is a high risk of exhaust fumes entering the car, which could potentially kill you or your passengers.
If the car passes the db and smoke test, it should make no difference if it's missing a silencer.

dgt · 13-08-2014 11:46pm

kapisko1PL wrote: »

Just like in the title.

I just bought the car (used) and it failed NCT when the old owner was trying to put it through. Reasons: Exhaust System Noise - Silencer - Missing. It is also leaking a little which is easy to fix.

Can a car with a straight through exhaust pass the NCT nowadays or did something change since I remember people saying that it can...

Is is a Seat Toledo 1.9TDI

Won't pass, needs backbox.

Buy backbox, install for test, get cert, replace box with straight pipe

Source: I drove a full straight piped diesel (from the turbo) for a year and a half :cool:

Cleveland Hot Pocket · 14-08-2014 7:35am

Just buy a car pre 1991 and you are graand !
No stupid Cat needed there.

kona · 14-08-2014 7:41am

betterget that hole fixed or the pidgeons will escape :eek:

NCT and straight through exhaust?

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