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12th December 2012, 00:30
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#1
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Frequent Poster
Join Date: Dec 2012
Location: Gravesend, Kent
Posts: 727
Car(s): 106 GTi, MK2 Saxo VTR, Corsa C SXi,
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MK2 VTR Sports Cat
Hi,
I've just got a MK2 VTR, and got a Group N backbox w/ straight through centre section today, the only thing its missing now is a Manifold, i ran decat on my old car but not worth the hassle now a days, but love the rasp/pops of decat, would you get the same sorta noise with a 4-2-1 mani and get a sport cat welded in my middle section? means its safe for roadside checks etc and dont have to faff around for MOT time.
Any ideas? thanks 
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12th December 2012, 13:10
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#2
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Established Member
Join Date: Mar 2011
Location: Birmingham
Posts: 2,148
Car(s): Rover BRM, Rover 800 Coupe, Mk6 golf.
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I ran a sports cat on my old system, with only the back box as a silencer and it popped and banged all day - drove me fucking nuts lol.
Passed an MOT though.
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12th December 2012, 14:37
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#3
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Saxperience Forum Bum
Join Date: Sep 2011
Location: Doncaster
Posts: 2,627
Car(s): Fabia VRS, mk1 fiesta + some others
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Quote:
Originally Posted by jasonmayall
Passed an MOT though.
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about that! :')
the sports cat silences alot. Going from a 4/2/1 supersprint to 4/1 sports cat, supersprint back box im at least 10db quieter. I dont get many pops either in comparison.
the decat is worth while. they sound much better for it.
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12th December 2012, 17:53
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#4
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Frequent Poster
Join Date: Dec 2012
Location: Gravesend, Kent
Posts: 727
Car(s): 106 GTi, MK2 Saxo VTR, Corsa C SXi,
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Quote:
Originally Posted by jasonmayall
I ran a sports cat on my old system, with only the back box as a silencer and it popped and banged all day - drove me fucking nuts lol.
Passed an MOT though.
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What system did you have fella?
i was thinking of geting a 4-2-1 manifold and get a mk1 centre section and get the cat cut out and weld a sports cat in its place; would that work? ive heard sports cats still pop and bang.. well ive read that from a google search; are the lamda sensors etc the same? i ran decat on my corsa and sounded epic it banged when changing from 1-2 and 2-3, i miss the sound but driving a saxo and going places like lakeside.. im bound to get pulled and knowing my luck get caught out!
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12th December 2012, 19:31
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#5
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Saxperience Addict
Join Date: Nov 2006
Location: A farm shed in Aylesbury
Posts: 14,916
Car(s): Corolla AE86
Peugeot 205 B18C (in bits)
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Quote:
Originally Posted by m4tt274
about that! :')
the sports cat silences alot. Going from a 4/2/1 supersprint to 4/1 sports cat, supersprint back box im at least 10db quieter. I dont get many pops either in comparison.
the decat is worth while. they sound much better for it.
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a centre silencer is cheaper and wont rob power.. 
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12th December 2012, 23:14
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#6
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Frequent Poster
Join Date: Dec 2012
Location: Gravesend, Kent
Posts: 727
Car(s): 106 GTi, MK2 Saxo VTR, Corsa C SXi,
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what do u mean buddy? centre cat or what?
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13th December 2012, 10:13
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#7
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Saxperience Addict
Join Date: Nov 2006
Location: A farm shed in Aylesbury
Posts: 14,916
Car(s): Corolla AE86
Peugeot 205 B18C (in bits)
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Your cat is a restriction in the system. Its a series of small holes the gases are forced to go through. A sports cat will have less but still potentially will have an effect on power.
If you are trying to kill the noise level then get a centre straight through silencer which will have virtually no effect on power.
Personally I would keep a standard cat for MOT time and swap straight after for 364 days of the year.
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13th December 2012, 13:40
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#8
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Frequent Poster
Join Date: Dec 2012
Location: Gravesend, Kent
Posts: 727
Car(s): 106 GTi, MK2 Saxo VTR, Corsa C SXi,
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No no i want the decat noise/rasp; not to kill it.. but running decat is bait with roadside vosa checks etc, do sport cats sound any different to normal cats?
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13th December 2012, 14:14
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#9
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Saxperience Forum Bum
Join Date: Sep 2011
Location: Doncaster
Posts: 2,627
Car(s): Fabia VRS, mk1 fiesta + some others
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they aren going to take your car apart at the side of the road.
tell them it has a cat...? saxsport has a dummy cat.
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13th December 2012, 14:44
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#10
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Saxperience Addict
Join Date: Nov 2006
Location: A farm shed in Aylesbury
Posts: 14,916
Car(s): Corolla AE86
Peugeot 205 B18C (in bits)
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Quote:
Originally Posted by James93
No no i want the decat noise/rasp; not to kill it.. but running decat is bait with roadside vosa checks etc, do sport cats sound any different to normal cats?
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we are arguing semantics of wording. The silencer is a better option for power and is cheaper. A straight through design not going to stop pops and bangs but will drop the noise by 10-12db
You may not get the same noise with a sports cat. It affects the sound waves as they have to negotiate a lot of small holes
As for VOSA - when have you ever seen VOSA doing significant roadside checks? For piece of mind go for a sports cat but other than being road legal it will never be better.
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13th December 2012, 15:03
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#11
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Saxperience Forum Bum
Join Date: Dec 2008
Location: Lancs
Posts: 4,124
Car(s): JP4S'd R.
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Seen VOSA in my small hometown 5 times this year.
Easily solved though.. as they're always on the same road / place. And plenty of alternative routes around it 
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13th December 2012, 18:37
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#12
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Frequent Poster
Join Date: Dec 2012
Location: Gravesend, Kent
Posts: 727
Car(s): 106 GTi, MK2 Saxo VTR, Corsa C SXi,
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VOSA are around alot where i live, especially when we go cruises like Lakeside and MCE, might go saxsport with dummy cat tbh
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