[knt]

Similar happen to me on one of the piston last year when I took the car in for timing chain service and walnut blast , blow out black smoke out of the exhaust.

 

[knt]

Is that CAT from the downpipe or further down to the back exhaust?

 

[knt]

Thanks mike1967.

I'll also probasbly need a new sports cat downpipe for mine.

Does de-catting the downpipe not fail MOT unless the tester can fiddle with the test?

 

[knt]

You're a quick worker .

 

[knt]

So this is an S with JCW parts?

Even 230-240bhp at the wheels for the JCW would be good .

Did you use engine running in oil with the fresh rebuild?

What engine oil are you using now with this rebuilt engine?

With my catch can, I'm am using stainless steel washing wool at the bottom of the catch can as I've read sponge filters will breakdown in the catch can.