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View Full Version : 4-2-1 Manifold on a VTR


Pitbull69
5th January 2012, 22:41
looking at getting a 4-2-1 Manifold and a sports cat as I dont know any 'friendly' MOT stations,

seen this one

http://www.kamracing.co.uk/index.php/citroen/citroen-saxo/saxo-exhaust/exhaust-manifold/janspeed-4-2-1-exhaust-manifold-sports-cat-saxo-vtr-00-03.html

would I still get decent gains with the sports cat, I see lots of recommendations for decats but I dont want to fail the MOT...

Also would it be worth getting a remap after this,

Nick_j_r
5th January 2012, 23:01
sack the sports cat off just change the exhaust back for the MOT, buy a manifold off here for about £100 instead of £390!

Karlb1
5th January 2012, 23:21
I'm selling a Janspeed 4-2-1 atm buddy, it's for a MK1 though so you might have to do the oil filter conversion depending which oil filter type you have. only want like £110 posted. Just change the cat back for MOT time.

Pitbull69
5th January 2012, 23:33
I dont fancy doing any conversions to be honest, want things as straight forward as possible, thats why I was gonna get a sports cat and have done with it,

Will have a think about changing the cat each year, but was also worried about them VOSA stop checks, or would they not bother with a saxo and a decat ?

Also any ideas on the remap, or would it run happy with just the 4-2-1 ?

Karlb1
5th January 2012, 23:36
Fair enough mate. VOSA checks are done on any car that seems to be modified so they can check if it's road legal etc.
It'll run fine with a 4-2-1 and you should notice the difference as the mani and the cat are the most restrictive parts of the system.

Pitbull69
5th January 2012, 23:44
what about sounds modified?

does anyone know what they would do if I ran decat and they check the car ?
like what punishment is it, car taken away fine etc etc

kennym1987
6th January 2012, 06:12
what about sounds modified?

does anyone know what they would do if I ran decat and they check the car ?
like what punishment is it, car taken away fine etc etc

my mate had a track vts which he used as a road car. long story short he had a run in with traffic police and they went over the car. he had a de-cat on it and they never even mentioned it

KamRacing
6th January 2012, 10:58
The sports cat might loose about 1-2bhp compared to a decat. Either way its negligible.
Sports Cats are expensive but they save a lot of faffing about.

Pitbull69
7th January 2012, 11:09
The sports cat might loose about 1-2bhp compared to a decat. Either way its negligible.
Sports Cats are expensive but they save a lot of faffing about.

Thanks for the input, what about noise difference between decat and sports cat, I was told with a 4-2-1 and decat its meant to sound really good, does the sports cat take away any of that?