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HKS Super Drager Cat Back System
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Old 31 Dec 2004, 11:32 AM   #1 (permalink)
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HKS Super Drager Cat Back System

Hi all

I have a 05 STi and want to get the HKS cat back system 8)

Does anyone know how the cat sensors will react to not having a cat anymore as well as would I need to get the ECU remapped.

And the last question, can I expect a serious power increase as I know it makes a huge difference on the sorry to mention it on this site :shock: EVO8 FQ320 from the model below which doesn't have the HKS super drager :?:

Thanks and much appreciated :wink:
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Old 31 Dec 2004, 12:32 PM   #2 (permalink)
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Hello Daz

I had a HKS System on my Prev WRX - probably the best made exhaust system I have ever seen IMHO. It is bloody loud mind you although you are looking to do Cat back so it shouldn't be too bad

Anyway I seem to recall reading that the Newages have some sort of exhaust probe, cat on fire sensor that if disconnected illuminates - not sure whether this is for the centre cat or the downpipe cat - I would have thought it would have been the d/p one. With your STI you have the centre cat removed anyway so I am sure its the d/p cat that will give you the problem BUT as you are doing Cat Back then you won't have this problem.

The Evo is a whole different ball game mate - AFAIK the FQ have revised engine management etc which matched to the Exhaust gives plenty more power. If you were to fit yours and take the car along for a remap then you may get an increase - again I'm not sure how big a rise in power you would get ? The HKS system will flow very well and even switching this for your existing STi system should make a slight difference - might give you an additional 5-10BHP and the car may well pull a bit better......this is of course all hypothetical as I don't have a NewAge so cannot tell you from experience. ops:

HTH
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Old 31 Dec 2004, 02:36 PM   #3 (permalink)
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I have a HKS cat back exhaust and it comes with the fitting in the short front pipe to retain the front sensor...
When buying the system you must ensure you get the short front pipe as the HKS systems are made for JDM cars not UK cars which have different exhausts due to the extra cat.
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Old 04 Jan 2005, 12:12 PM   #4 (permalink)
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Hi Pete

Thanks for the info :wink: So all in all would you say its a worth while buy or would it be better just to by another back box? Does HKS sell the back box seperately for my car?

Daz :wink:
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Old 04 Jan 2005, 05:43 PM   #5 (permalink)
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Quote:
Originally Posted by Daz99Turbo
Hi Pete

Thanks for the info :wink: So all in all would you say its a worth while buy or would it be better just to by another back box? Does HKS sell the back box seperately for my car?

Daz :wink:
You can not fit just the back box as the HKS is designed around the JDM exhaust which has it's joints in slightly different places....

Yes the HKS is worth while and will remove your centre CAT

The sound is sweet... LOUD but not intrusive (well no complaints from neighbours )

JW Racing is a good company to use have a look on their site http://www.j-w-racing.com/

DON'T FORGET you will need the link pipe
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Old 04 Jan 2005, 09:53 PM   #6 (permalink)
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At one of the PE RR days I attended, there was a chap with a decat system only fitted to his MY03 STI UK, and he got around 55bhp increase over standard. Torque wasn't that much higher than standard. He had to change the restrictor to stop boost spikes.

Pretty impressive.
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Old 04 Jan 2005, 11:07 PM   #7 (permalink)
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Was that a total decat?

If so what restrictor did he have to chance as I am thinking about going down this route?

Buzz
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Old 05 Jan 2005, 07:23 AM   #8 (permalink)
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Hi Buzz,

yep full decat.

don't know about the restrictor size, I was too amazed at the bhp increase !

I can't remember the chaps name either, - sorry.
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Old 05 Jan 2005, 12:11 PM   #9 (permalink)
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Thats awesome

Thats the only thing that worries me though is what can go wrong :shock: and then there is the warrenty :roll:

Seriously considering buying another Vortex Afterburner! It was great on my classic!

Scooby is getting to smart as from what I've heard even just replacing the dump valve your not gaurenteed on the new scoob not switching to fail safe mode :evil: :?:
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Old 05 Jan 2005, 01:27 PM   #10 (permalink)
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Very true Daz - I have been quite interested in a post on another forum (the name of which escapes me) in which a guy has a Newage and when he took it cos it was giving him trouble - the dealer started to Moan about the fact that cos he had an aftermarket dump valve they may not honour the warranty and that the problem was probably down to the VTA being in place !! It turned out that it was a loose pipe nowhere near the dump valve but they still tried to say it was linked to the dump valve !

Makes you think doesnt it :shock:
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Old 05 Jan 2005, 02:40 PM   #11 (permalink)
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Hi Nelson :wink:

The Ba%"*rds :shock: :evil:
The guys at an HKS dealer I use told me he didn't want to sell a the SQV BOV for my STi as he says they seem to give trouble on the new scoob :?: Whats even more annoying is that he said some are ok and others give trouble :? :?:

IF you ask me, theres just to much sensors and electronics involved :?: I must say in terms of mods the classic was so much more user friendly :?:
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Old 05 Jan 2005, 04:16 PM   #12 (permalink)
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Well its worth having a word with your dealer mate cos they may be fine about some mods

As for running well I do know that Gareth had a Lag issue when he fitted the HKS SQV to his Newage I just think that cars are being pushed further and further now with technology and yes to some degree the Classics are maybe a little easier to play around with when it comes to mods. However the NewAge is already a leap forward on the classic in terms of power, handling, braking etc so to be fair Subaru probably just assume that owners of STI8's like your good self would be more than happy with the performance having owned an older Classic ? Just remember the Classic had the plugs for the ECU wheras the one you have has to be connected to some diagnostic software........horses for course I think. Going on from that I think the Dumper, exhaust etc etc is fine aslong as you are prepared to go for revised engine management.......should you experience problems when running these Mods with the standard setup............just remember your STI is kicking out a lot more power than us UK Classics and I won't even mention PPP
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Old 06 Jan 2005, 12:05 PM   #13 (permalink)
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Hey Nelson

Yeah I should be content with the power but one can never have enough! Just bought an afterburner vortex for a bit of a howl and growl but think I'll leave it at that, well at least for now :wink:

I'm a bit confused ops: though Nel is the new one an STi8 or STi9 cos mine has the new, longer and wider chassis, new suspension as well as the active yaw control?

Any new mods on yours M8 :?:
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