What effects will this have on my cars performance? Will it cause back pressure and give a rougher idle? I'm sure it will fail the NCT over this.

should I nip this in the bud now or can I leave it another month or 2

 

Could make an O2 sensor go off.

 

Whereabouts in the exhaust system,?
Manifold, pipes, cats, silencers?
Can you just slap some exhaust tape over it?

 

Are you talking about the drain holes to allow condensation to drain out and not fill the exhaust with water? If so theyre there for that reason

 

The area around the hole is very fragile from the rust

 

Again, where is the hole?

 

I can't seem to upload a picture but the hole is in the catalyst exhaust pipe on the far side just in the grove where the catalyst connects to the rest of the exhaust

 

Can you get in there with some exhaust tape or Gun Gum or similar?
https://www.halfords.com/workshop-to...gum-putty-200g

 

That gun gum looks perfect for the job thanks

 

 

 

Any good muffler shop or wleder can weld that up

 

I filed off most of the rust around the hole and have it a little sanding before I packed on a load of gun gum.
I put on a lot to make sure I prevent another hole appearing anytime soon. I will replace this part in a year unless it gets worse in the meantime.

this is just my quick fix to pass the NCT in a couple of months.

 

This is it filed and sanded, the rust isnt gone 100% but this is just a quick fix to get through another year. The area around the hole is solid i had recoved any loose metal.

 

 

Plenty of gun gum

 

 

Hope it works ok!