Good afternoon all

Had the scoob up on ramps this weekend and was greeted with the sight of a totally rotten exhaust system. While this puts back my visit too powerstation for suspension mods This gives me the perfect excuse to have a new sytem put on and actually have my car sound like it should do

Need some advice tho, Firstly while il definately get rid of the second Cat in favour of a decat pipe I dont fancy getting rid of the first so i shouldnt have probs with emissions. So should i leave the first one in place or should i pay for a sports cat up front. Bearing in mind id like a Tek 3 remap at some point for sub 300BHP is this a possibility with the original subaru cat?

Secondly i want a system to release the burble and growl under acceleration but i would still like to hear the stereo on a motorway and not have to shout at passengers at 70mph Does anyone know of a system like this, I was considering either the racebox catback system from Scoobywold or going down to Pro-speed exhausts in cardiff and getting a system tailor made there

Cheers for any advice

Ian

 

Just for smething to bear in mind.

Ive been doing some investigation into decats and BHP, and it apparently is an urban myth that a decat downpipe will give you that magic 30+ extra BHP. Realistically your looking at 5 BHP tops. A decat system will make your car "breathe" better and argueably more "torquey".

For serious BHP increases, your looking at chips and re-maps.
What do the rest of you think??

 

I'd say that a full de-cat would give a bit more than 5 bhp over the standard cat, i think the 5 bhp difference is between a de-cat and sports cat.

Personally i'd change the front pipe, although you don't have to do it all in one go, buy the cat back system now and get the downpipe just before you get it re-mapped.

As for noise best thing to do is go i a couple of peoples cars and see what you think of the volume of the different systems, you can always sound proof the floor of the boot to reduce the noise inside.

 

I recently put a Blitz Nur Spec R exhaust and a decat section on my WRX. I was told the Blitz is the daddy. It is quite loud when accelerating but quietens down once at cruising speed. If you give the car some welly it sounds lovely.

 

After reading your post Dean just had a thought if i was to put a full system on including front pipe would the car run ok on its standard map or would it require a remap as a necessity?

Cheers

Ian

 

There are varying views on this, with a sports cat you'll be fine and most people would say even with a full de-cat on a UK Classic it will be fine (altough to get max power gains then re-map is needed), lots of people on here have them, sure SSS runs full de-cat with no remap. Think its the jap models and P1's that require a re-map coz they run close to the limit on UK fuel anyway.

 

my jdm sti increased by roughy 35-40bhp by having a full miltek system with sports cat and tek 3 re-map - well worth it in my humble opinion

 

From what I found out you can run a full decat and uprated panel filter without the need of a re-map on a uk car (make sure the filter is dry and not oiled)

I would seriously consider a sports catted down pipe, they have dropped a lot in price just lately then you can simply fit a centre and back box onto that (when you get a down pipe get an open neck one though )
You can find second hand centre sections on here then either look out for a second hand back box or buy new they are all stainless now so age is not an issue, it's a good way of saving money I got a magnex centre they are quite cheap anyway... around the £80 mark new I think.

If you are going to fit a larger turbo I would then hold back with a TEK3 until you have that ready to go on, otherwise you will be paying for two mapping sessions. Another thing to consider is a knocklink as a safety measure.

 

What does the Milltek Sound like Pippy? is that sytem from powerstation? if you dont mind me asking what was the damage for that?

Do people have an opinion on whether a 2 1/2" system should be used or 3" system?

Cheers

Ian

 

I had a EcuTEK re-map at Powerstation on my old Silver WRX 01MY. Went from standard (218) to 264 BHP/334Nm all the cats still on and an HKS Hybrid panel. With a Milltek as part of the package you are looking at over 270+

www.powerstation.org.uk

They have reduced their prices by a few hundred quid too!

 

Will back you up the Dan this zorst sounds very nice on full throttle but werent to bad going to japfest which i was surprised at.
I only took out the centre cat ( system is down pipe back ) which leaves the cat on the down pipe, the guy at Pro-Speed told me that i would get away with one cat at MOT time.Re-map will be next hopefully but the cars is running ok for now( touch wood )

Oh and the Blitz comes with a baffler also,so if its not loud enough for you just take it out.But i havent got the guts to do that yet.
Old houses where i live so they may fall down

Good Luck

 

Ask yourself this question Ian, do you do early starts for work etc ? do you finish late etc if yes then a loud system may be a no no.
Scoobysport used to do a system with good power gains without shouting about it but gives you the classic scooby burble, check them out scoobysport

 

If you look at my thread here about halfway down the page (post 106):

http://bbs.scoobynet.co.uk/showthrea...=492944&page=4

Write-up of remap on my MY00.

Basically, with this:

Magnex resonated centre decat
Magnex oval backbox
Ninja Sports Cat
JR Panel filter

It made 230bhp (15bhp gain over standard)


When remapped it made 273bhp.

So the remap made 43bhp on its own, as opposed to the breathing mods making 15bhp on their own.


Oh, and the Magnex/Ninja combo makes a decent noise without being too intrusive.

I used to have a full decat Afterburner/Ninja backbox on my old MY95 WRX, and that was a fair bit noisier.

 

Ian,

personally i like the sound. Its not too loud unless i want to be (by opening the engine up) so its resonably good on the neighbours etc I use as my everyday car as well so wouldn't want it any louder than it is...

Mine is a JDM so comes with the equal length headers - as a result the car was quiter than a uk spec with unequal anyway. Glen (not sure of his id) has just put the same system on a uk spec so it would be worth taking to him. Come along to the next J30 meet and you can hear it for yourself.


As for cost i bought the car at 9 months old - the work was done from new (by powerstation) so not too sure on the cost - again glen should be able to help you on that

btw mine is 3" i think (no jokes please)

 

how many cats are there fitted to a clasic shape wrx? were are they? fitted i thought there was just one in the down pipe will the car run ok with both the cats removed?

 

When I bought my MY95 WRX, the bloke I bought it off told me it had been decatted and gave me the centre pipe for the MOT.

So I always thought there were two, one in the downpipe and one in the centre.

However, when I mentioned this the other day on here, somebody said that the middle was a resonator not a cat??

Anyway, it is fine to remove them both - whether the centre is a cat anyway I don't know.

On my MY95 WRX, it ran fine fully decatted. Boost was upped naturally about 2psi, and there was no knock at all running the Z4 ecu on Optimax alone.

 

i may stand corrected but i think its 2 on a classc and 3 on new-ages?

 

so what a resonator? what it do? this is all very confusing
on my car the cat on the down pipe seems to have been removed. but a chap i was talking to said that the cat was conected at the end of the down pipe to the middle pipe. there is a wire mesh thing there but i thought that was just a flexi and looks to small to be a cat.

on the last wrx i had the cat on the down pipe had been removed there was also a smaller pipe about an inch wide coming off the turbo runing down along side the down pipe and then joining back into the down pipe any idea what that was?

 

Sounds right to me, the standard centre section on a classic has 2 "boxs" a resonator and a cat unles you have a P1 i believe they only have one cat. Think newages have some sort of cat in the uppipe aswell.

 

The resonator is just a 'box' that looks like a cat, but is only there to reduce noise as far as I am aware.

If your downpipe has been changed, then one cat will have been removed.

Some of the downpipes have two pipes where they join the turbo ('twin-dump'), whereas most these days have an oval large 'bellmouth' design.


Twin-dump (scroll down a little bit):

http://www.powerengineering.co.uk/ac...s_exhausts.htm


Bellmouth:

http://www.wrxtuners.com/parts/produ...roducts_id=469

 

The garage that fitted the exhaust took the baffle out. I put it back in then took it back out again. Its loud and great fun

 

www.sidc.co.uk go to the faq's It's all there.

Newage resonator = Silencer
Newage Cats in the Up pipe to the turbo and Down pipe to the Resonator.

 

Hmm Had a ring around looking at best part of 800 quid for a full system and fitting with a sports cat

Leaning towards the Racebox cat back system from scoobyworld at the moment rather than prospeed, its a bit cheaper and would allow me to use a ninja sports cat system from them in the future come remap time. any one heard one of these cat back systems?

would people prefer one from a scooby specialist or one from a reputable dealer like pro-speed?

Cheers

Ian

 

£649 for a Full Ninja including Sports front cat and decat centre for a Classic and or £450 ish for a Newage System with decat down pipe. Scoobyworld.

 

I thought a sports cat was around the 400 mark give or take

 

No they were £299 on offer when they first came out, they have now gone up to £349.

 

Got a Prospeed exhaust on my '93 wrx and recently had a de-cat done too. The sound is awesome, really deep burble since the de-cat, however may be a little loud for some tastes. Recently had it rolling roaded at Powerstation when all the guys from here went up and it made 274bhp with a viper induction kit. Not bad considering 238bhp is the standard figure and its still on the standard ecu with no remap. A few more tweeks to be added though 300 here i come!