Is this worth doing in terms of gains? Is it a big job? Will it still pass the mot? Does it affect insurance?

Questions, questions

I've got no pre-cats and got through the first mot this week.

Fast Idle test.
RPM = 2770 (allowed 2500 -> 3000)
CO% = 0.004 (allowed up to 0.3)
HC ppm = 0 (allowed up to 200)
Lambda = 1.001 (allowed 0.97 -> 1.03)

Natural Idle test.
RPM = 658 (allowed 450 -> 1500)
CO% = 0.005 (allowed up to 0.5)

Apparently a 'test drive' to warm the remaining cat was required though

Not bad figures there Tony,

I think I will defo get mine removed. do you get much more power gain?

I bet she sounds nicer aswell

Tony (Like me, Gus, Duncan, Dave, Bazza etc) has a supercharger, and therefore the pre-cat removal is reccomended to avoid them breaking up and blocking the manifold.

For a N/A car, I suspect removal will only offer negligable gains....

Thanks for that Zee, but then again, any gain is a positive don't you agree?

It all falls in with the master plan anyway.........charger

Just to correct Zee, it doesnt block the manifold, it blocks the Main Cat

I had my pre cats removed a couple of weeks before fitting my S/C.
Driving it round for those 2 weeks i noticed that the engine rev'd more freely which gave a sense of more power. It also made the zorst note sound deeper.

What you really need is a nice big bore manifold

Just pop back in my garden shed chaps

Don't forget me Dave

Think I'm ready for the next round of mods now

How can anyone forget you you man

Back in the shed