Hiya guys, not posted on the forum much since it went down a wee while ago, and now just getting back into messing around with my coupe

My question is, what kind of effect will removing my decat pipe and putting my cat back on have on my driving experience.

The reason I want to put it back on is just to make the exhaust less noisy on motorways. I guess I'll loose some power - 10 BHP-ish? But what about boost characteristics etc?

I'm running around 270 BHP with hybrid turbo, pace intercooler, novitech chip, electronic boost controller.

Cheers,

Al

The cat will make the car feel as if its struggling more to rise through the revs. Apart from that, no other differences i believe.

Ross

You will loose about 3% power I believe (high flow KAT), thats the only real effect. I put my KAT back on because the car stunk without it, it also helps the exhust note when motorway driving! Much better on in my opinion.

I hope it doesn't feel too restricted

Got the day off work so I'm going to get the ratchet set out and swap them around now.

Thanks guys!

Nah. It will just feel restricted to you because you have felt it with it off. You'll know what i mean when you drive it afterwards.

Ross

Mine feels flat as a pancake running with the CAT, very sluggish off the line before the revs build.

i hated mine when i put the cat back on for the mot, felt sluggish and had loads more lag, couldn't wait to put the decat back on!!

Well, I put the cat back on and took it for a spin. Agree with everything written above; the power delivery is a little 'strangled' but it is a LOT less noisy.

I no longer have the fighter-jet screem when on full boost, which I know I'm gonna miss but sometimes it was almost unbearable, especially after a long day at work when all I wanted to do was drive quickly and listen to some relaxing music at the same time: impossible combination with the decat

How about if I went for a race-cat type thing? How much of the power and noise would I get back?

What about a decat and a free-flowing silencer? I have a race cat and still is so noisy, so I am going now for a decat and a 65cm long silencer afterwards...

Sounds like a good idea! Let us know when you have the silencer fitted, and how it feels.

Al

..Plus my race kat cant flow the 400 bhp I have or so

Am i right in thinking that decating will improve spool up,
and help acceleration

Ben

Yes Ben, having put the cat back on, I can feel the engine being restricted.

The engine was much more free-flowing without the cat, but it was also very loud; fun at times, but gets tiresome for everyday use.