Fitting a temporary cat for MoT

[Frimley111R]

My Megane R26 is decatted and was like that when I bought it. I have the cat but apparently it is the devil’s own job to fit/remove (driveshaft out!). I’ve seen someone who had cut the straight pipe (under the car, between the front seats - see pic below) and fitted a cheap cat there that can be unbolted/bolted for MoTs. Just before I do this I want to be sure that pretty much any cat will do (bear in mind my car is only a 4 cylinder turbo).

In the other example I saw the guy welded in two slightly larger sections so the cat/straight pipe could just be slotted in/out. Seems quite a good solution?

Or is there an alternative?

[Frimley111R]

Tyre Smoke said:

Or find a friendly garage?

Is there such a thing or it this some mystical place that always gets brought up when these type of questions are posed?

[Frimley111R]

Thanks, I quite favour the 4 bolt system even if it requires a bit more work initially but I may try this too.

[Frimley111R]

Bennachie said:

'Course, you could just make it legal............................

Its only my track car and hoon car. If it was my daily it'd be different.

[Frimley111R]

paintman said:

What stevieturbo says ^^^^
Friend of mine bought a used supercharged RRS & wanted the autobox fluid & filter changed even though it's supposedly filled for life.
Exhaust is in the way & apparently needs a lot of other dismantling to remove it.
The solution was to cut out a section & then refit using the type of clamps shown in the link.
I'm told the fluid that came out of the box was pretty grim & so was the filter.

Edited by paintman on Friday 9th February 12:45

Yep. I found this http://bit.ly/2H1Ac1h so all I need to do is cut it and the exhaust..

[Frimley111R]

stevieturbo said:

I wouldnt have high hopes for a £30 cat performing well....even more so when it's the secondary cat of a system that normally uses a couple.

And the front flange on those will usually required a tapered mate as opposed to a flat flange if you wish to make use of the flanges.

Really the best cat you could use...is an OEM one.

An R26 only has one cat. i think I'll try the flange option second and go with the cut and connect option first

[Frimley111R]

E-bmw said:

He knows that, he was meaning you are fitting a cat that is designed as a secondary cat & assuming it can fulfil the duties of a sole cat.

Ah I see. That's a good point, thanks.

PS: Would it for the purposes of and MoT?

[Frimley111R]

Ok thanks, swapped the cat for another one. TBH at £40 its not too much to buy one each year