How long to change decat to cat?
How long to change decat to cat?
Author
Discussion

21TonyK

Original Poster:

13,381 posts

240 months

Thursday 15th November 2007
quotequote all
Stupid question really and I assume no more than a couple of hours but I'm not sure whether to do it tomorrow or after the weekend (when I want to be out driving).

Am I going to get the decat pipe off and fine I need new gaskets or should it just be a simple swap bearing in mind it was all apart only 250 miles / 6 weeks ago anyway?

Ta

S Works

10,166 posts

281 months

Thursday 15th November 2007
quotequote all
About an hour and a half if you take it steady and the bolts play ball.

jke11y

3,200 posts

268 months

Thursday 15th November 2007
quotequote all
Changing out the standard CAT on my S2 Exige was a total slut of a job.

The cat to manifold nuts are made of jizz, and rounded at the first sight of a spanner and were rusty, so had to buy new ones from local Toyota dealer. They had none, so cue 3day wait. I would recommend getting some for standby prior to starting.

Also, one of the bolts (there are only two that hold the CAT pipe to the doughnut joint thing) is fairly inaccessible unless you have a range of sockets / angle things / extensions.

Hope that helps.

Redlake27

2,255 posts

275 months

Friday 16th November 2007
quotequote all
I've got an S1 with the 135 kit (which includes a 'decat' )

Every year I get charged two hours labour to fit/remove the cat at MOT time.

My question is?

Does anyone know if there is any significant BHP difference with or without the cat on a 135. If it's 1 BHP, I'm not bothered, but if it is 10, I'll put up with the annual decat/cat process

retrorider

1,339 posts

232 months

Friday 16th November 2007
quotequote all
buy a sports cat and dont waste your time or money.sounds just as nice...

Lotus Lewis

692 posts

238 months

Friday 16th November 2007
quotequote all
I was going to do what your think get the decat pipe and change it back for the MOT, but i found out that when you decat the car it will be come illegal so you are driving around with no insurances so it was a risk i didn't want to have ,i went for a hurricane kit instead

21TonyK

Original Poster:

13,381 posts

240 months

Friday 16th November 2007
quotequote all
Cheers guys,

I'll find out if all is well in the morning. Cars reversed into the garage with blocks waiting and the cat unpacked and ready to go.

HOPEFULLY a simple swap over.

Phil. S.

180 posts

261 months

Friday 16th November 2007
quotequote all
Redlake27 said:
I've got an S1 with the 135 kit (which includes a 'decat' )

Every year I get charged two hours labour to fit/remove the cat at MOT time.

My question is?

Does anyone know if there is any significant BHP difference with or without the cat on a 135. If it's 1 BHP, I'm not bothered, but if it is 10, I'll put up with the annual decat/cat process
You'll lose around 3bhp (unless you have a vvc in which case you'll gain 1 or 2). You won't notice it, though it will be quieter. I put mine back on because it was just too loud without.

Hollywood Wheels

3,689 posts

261 months

Friday 16th November 2007
quotequote all
Lotus Lewis said:
I was going to do what your think get the decat pipe and change it back for the MOT, but i found out that when you decat the car it will be come illegal so you are driving around with no insurances so it was a risk i didn't want to have ,i went for a hurricane kit instead
Even a car without any MOT isn't necessarily 'uninsured'. My mods are all declared to my insurer, including the decat pipe, and it was on there when the car was accessed for a £4K claim last year....

retrorider

1,339 posts

232 months

Friday 16th November 2007
quotequote all
this is worth a read.conclusion = why bother

http://www.mgf.ultimatemg.com/group2/exhaust/catal...

Lotus Lewis

692 posts

238 months

Friday 16th November 2007
quotequote all
Hollywood Wheels said:
Lotus Lewis said:
I was going to do what your think get the decat pipe and change it back for the MOT, but i found out that when you decat the car it will be come illegal so you are driving around with no insurances so it was a risk i didn't want to have ,i went for a hurricane kit instead
Even a car without any MOT isn't necessarily 'uninsured'. My mods are all declared to my insurer, including the decat pipe, and it was on there when the car was accessed for a £4K claim last year....
Oh right, will my insurance price go sky high with a decat pipe has anyone been quoted an insurance price before a decat and then with a decat, just wondering what the difference in price would be

S Works

10,166 posts

281 months

Saturday 17th November 2007
quotequote all
There is pretty much no point in a decat pipe whatsoever from what I can make out. 1-2bhp if that. Waste of time and money.

Hollywood Wheels

3,689 posts

261 months

Saturday 17th November 2007
quotequote all
Lotus Lewis said:
will my insurance price go sky high with a decat pipe has anyone been quoted an insurance price before a decat and then with a decat
If your insurer tries to up your premium, then you need to be looking elsewhere for insurance. My mods (Nitrons, Hurricane, Sports 'zort, decat...) make no difference.

Plenty of people will say the decat isn't worth it, but for me the popping and banging is worth it. Don't do it for BHP gains. I may even be replacing mine soon because with the hardtop on the noise is unbearable (I use earplugs all the time now). However, a run through a tunnel as I watch the walls light up with the flame from the back of the car makes the hassle worth it. Others feel differently, fair enough.....

S Works

10,166 posts

281 months

Saturday 17th November 2007
quotequote all
I found that mine ran better with the cat on HW. Pulled harder in all gears. Was deffo not as good with the decat, despite the fun and games.

Hollywood Wheels

3,689 posts

261 months

Saturday 17th November 2007
quotequote all
yes You're not the first person to say this Tim. Was never bothered about BHP gains, and the car is an utter pig at low speeds anyway! The noise is just getting beyond a joke now, so it may be coming off depending on mileage this winter....

Lotus Lewis

692 posts

238 months

Saturday 17th November 2007
quotequote all
Hollywood Wheels said:
Lotus Lewis said:
will my insurance price go sky high with a decat pipe has anyone been quoted an insurance price before a decat and then with a decat
If your insurer tries to up your premium, then you need to be looking elsewhere for insurance. My mods (Nitrons, Hurricane, Sports 'zort, decat...) make no difference.
As you know Hollywood wheels ive just fitted my hurricane, do i need to let my insurer know ive got this on the car now

S Works

10,166 posts

281 months

Saturday 17th November 2007
quotequote all
Yes.

Lotus Lewis

692 posts

238 months

Saturday 17th November 2007
quotequote all
Just phoned my insurer about the hurricane and the price is still the same they just have to make a note of it so all is well smile

S Works

10,166 posts

281 months

Saturday 17th November 2007
quotequote all
An insurer with common sense, yay thumbup

Lotus Lewis

692 posts

238 months

Saturday 17th November 2007
quotequote all
S Works said:
An insurer with common sense, yay thumbup
Yea the bloke on the phone was cool with it must be a PH hehe