Solid/Experienced advice on Newage STi Catalysts
17 January 2012, 08:41 PM
#1
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Solid/Experienced advice on Newage STi Catalysts
Evening Gents,
Want some solid info preferably on those that have made catalyst changes, primarily because I do not want damage and secondly to save hassle on MOT day.
Hawkeye STi... has 2 cats.. one in the downpipe and a second one under the car.
I want the best performance from my Hawk STi but do not want the effort/cost of swapping the downpipe every MOT day.
I have heard I can get a decat downpipe and just bolt on the 2nd cat when MOT day comes, this avoiding the unbolting from the bellmouth/intercooler removal.
Can someone confirm that this will pass the MOT having only the 2nd cat on...
Cheers!
Want some solid info preferably on those that have made catalyst changes, primarily because I do not want damage and secondly to save hassle on MOT day.
Hawkeye STi... has 2 cats.. one in the downpipe and a second one under the car.
I want the best performance from my Hawk STi but do not want the effort/cost of swapping the downpipe every MOT day.
I have heard I can get a decat downpipe and just bolt on the 2nd cat when MOT day comes, this avoiding the unbolting from the bellmouth/intercooler removal.
Can someone confirm that this will pass the MOT having only the 2nd cat on...
Cheers!
17 January 2012, 08:56 PM
#2
Best bet is to remove the second cat and keep the cat in the DP. 
You will see some performance increase removing the cat in the DP but given you're capped by the small TD04 turbo coupled with oodles of torque anyway, why bother
I run a sports cat in mine, but mine is an STi
Highly unlikely you will pass an MOT with the small cat, and if left in you will muller it anyway with the decat
You will see some performance increase removing the cat in the DP but given you're capped by the small TD04 turbo coupled with oodles of torque anyway, why bother I run a sports cat in mine, but mine is an STi
Highly unlikely you will pass an MOT with the small cat, and if left in you will muller it anyway with the decat
17 January 2012, 09:06 PM
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My 04 Blobeye passed last year with just the 2nd cat no problem.
This year it had a Prodrive downpipe with the sports cat and no second cat. It passed fine this Saturday. I don't know the testers so there were no favours done!
No remap yet for either change.
This year it had a Prodrive downpipe with the sports cat and no second cat. It passed fine this Saturday. I don't know the testers so there were no favours done!
No remap yet for either change.
17 January 2012, 09:47 PM
#4
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Best bet is to remove the second cat and keep the cat in the DP. You will see some performance increase removing the cat in the DP but given you're capped by the small TD04 turbo coupled with oodles of torque anyway, why bother
I run a sports cat in mine, but mine is an STi
Highly unlikely you will pass an MOT with the small cat, and if left in you will muller it anyway with the decat
You will see some performance increase removing the cat in the DP but given you're capped by the small TD04 turbo coupled with oodles of torque anyway, why bother I run a sports cat in mine, but mine is an STi
Highly unlikely you will pass an MOT with the small cat, and if left in you will muller it anyway with the decat
53, mine is an STi and all, sitting at 298.5 last dyno, since then all I have done is put a H&S non res centre section and Scoobyparts Tornado 2 exhaust, felt a bit better from that alone.
Wonder what I would get from a 100 cell sportscat with panel filter.
17 January 2012, 10:00 PM
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17 January 2012, 10:03 PM
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17 January 2012, 10:08 PM
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But at the same time I cant be done with replacing the cats every year and risk damage to intercooler hoses and studs etc, its a chore..then there is roadside testing..
Wonder what the most someone has made from a 2.5 STi with a 100cel and filter...is 350 too optimistic!
17 January 2012, 10:16 PM
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My bug STi was running at 360 bhp with a APS 3 inch system with sports cat on OE injectors and OE turbo. List was FMIC, RCM Headers APS Exh, uprated fuel pump, aeromotive FPR and a GEMS ECU. All I had to do was refit the OE ECU for an MOT, just had to tickle the revs to get it through. I always had to gun the car prior to MOT and get the emissions done on arrival. Where in scotland are you (might be able to make a suggestion by PM.)
Last edited by 360ste; 17 January 2012 at 10:17 PM. Reason: spelling
17 January 2012, 10:17 PM
#13
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Good torque figure! I always feel thats where it counts more than BHP.
Only thing is the EcuTek licence and remap, plus walbro bumping up the costs. I imagine itll be well worth it though!
17 January 2012, 10:19 PM
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My bug STi was running at 360 bhp with a APS 3 inch system with sports cat on OE injectors and OE turbo. List was FMIC, RCM Headers APS Exh, uprated fuel pump, aeromotive FPR and a GEMS ECU. All I had to do was refit the OE ECU for an MOT, just had to tickle the revs to get it through. I always had to gun the car prior to MOT and get the emissions done on arrival. Where in scotland are you (might be able to make a suggestion by PM.)
Id love to get 360 as I have heard that is a very good figure combined with the weight in these cars to be a proper challenge for the rich toys.
Im up in the Highlands bud, Inverness.
17 January 2012, 10:57 PM
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When i have asked questions they were very helpful. Last time I was there was to get the APS 3.5 inch de-cat exhaust. Always try to do the fitting myself if I can.
18 January 2012, 11:11 AM
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The other thing to remember is the new mot laws are that if it is supposed to have 2 cats 3 cats from the factory that's what you have to have test day and vosa are updating their data bases with the same info and will be targeting modified cars in road side checks this year according to the vosa guy that was checking my lorry over yesterday
02 February 2012, 09:33 PM
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The other thing to remember is the new mot laws are that if it is supposed to have 2 cats 3 cats from the factory that's what you have to have test day and vosa are updating their data bases with the same info and will be targeting modified cars in road side checks this year according to the vosa guy that was checking my lorry over yesterday
I just read up on this!
Exhaust
A catalytic convertor fitted as original equipment but missing will be a reason for failure.
WTF???!! So if I get a single sport cat to replace my two cats then I will fail...
02 February 2012, 09:40 PM
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02 February 2012, 10:03 PM
#29
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It's the beginning of the end .the government seems to think all custom /modded cars are run by 18 year old hoddies street racing each other under the influence off drugs and booze while beating old grannies up .so in their eyes they are working towards stopping modded cars being run on the road .well thats my rant anyway
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