I got my CAT taken off a couple of months ago and replaced with a Mongoose pipe, I now have a full Mongoose system.
The car feels a lot smoother and more responsive now, it also sounds nicer aswell It is definitely worth doing. I don't have any figures to show you the difference, I can only go by the difference it made to the overall driveability.
I will need to put it back on for the MOT but I don't think it's too much hassle considering the difference it made to the car. Having said that, the place I take my car to for the MOT probably won't even notice.
If it's L reg, you can remove the cat and use a certain MOT loophole.
Make it difficult to read your engine number off the block. They then have to test it as if it doesn't have a cat. This only applies up to mid '94 cars IIRC, M reg anyway.
This is not a rumour, it's a fact. Got mine through it's MOT for the last 4 years with no cat.
Nice one, sounds good Russ. I might give that a go. I remember speaking to Gav at the Autosport show about removing the cat and as soon as I said I still had the cat on he made sharp inhalation of breath through the teeth noise.
Turbos respond well to any mods that reduce the exhaust backpressure.
It's not really max bhp that you gain, because max boost will be the same - but the turbo spools up faster and holds it more easily at high revs.
Ideally you want a THICK and straight exhaust from the turbo onwards.
Mine has no cat (a 1991) and my emisions readings were 0.69%. Leagally you must fall below 0.5% so if the car is really well tuned it might make it without a cat. Its worth checking out, see what your current reading is and if its worth trying to get it down.
A random spot check by the Police will net you points and a big fine as well
I've got a full Scorpion system with de-cat pipe, I don't think the de-cat made much difference but it sounds a bit better. The garage I go to reckon its not a worth while mod unless its a turbo'd car (they mainly deal with scoobies and evo's though).
Originally posted by imcsherry I've got a full Scorpion system with de-cat pipe, I don't think the de-cat made much difference
You have to see the whole as the "exhaust system".
From the end of the turbine blades till the end of the backbox.
You could drop the cat, have more noise, and result with no less restriction, if the piping is substandard. It happens more often than it should!...