[STINewbie]

Thx for the very quick reply, I don't have the possibility to hear the different sounds live, because I quess in my country we have couple exhaust mods done to Subarus, and they are often Remus,Prodrive and probaply couble of HKS&Greddys.
So I'll have to decide by the videos at youtube

Does every aftermarket downpipe add the same amount of power, if tuned to it's limit, and could this be done to stock aswell?

If someone could answe my 1-5 questions separelty, I would appreciate it very much.

[Gondy]

Originally Posted by STINewbie

This is my first post here, asked the same question at nasioc but didin't get any answers

The begining is a little offtopic.

My previous car was a 2003 Wrx, that had a aftermarket exhaust, and I loved the sound of it, the sound that my new STI just doesen't have

So im planning to get a new exhaust+downpipe to my stock Sti 06, and the car tuned after that.
I've been searching fot different ones for the last couple weeks.
Youtube is full of exhaust+downpipe videos, and the most popular ones are
Invidia,Cobb,HKS,Perrin,SPT,Blitz,Greddy.
I really like the aggresive/loud ones, like Invidia N1 and Blitz Nur spec R.
But heavily modded STI:s usually have COBB or Perrin.
So my goal is to get a good performance setup with nice aggeressive sounds.

My questions are about downpipes:

1) Is there a power/sound/Price difference between Catted and Cattles Downpipe?

2) If I buy a catted exhaust (otherwise the car would be illegal at my country and wouldn't pass the emisions, if that is the correct term) Could still have a cattles downpipe and pass the emiossions?

3) Does downpipe create different sounds for example Invidia vs Cobb?

4) I'm planning to mod my car to 350-450 hp, what would be a good choice for my downpipe

5) I've narrowed my exhaust options to Blitz Nur spec R, Invidia N1 or G200, HKS, or COBB
Could I buy any downpipe for these, or does it have to be Catted,Cattless, Bellmouthed, Divorced or what ?

It's very hard to choose the right ones, if you don't have any kind of knowledge yourself, and everyone have their own opinions.
But if someone could guide me to the right path

1) Yes
2) Not sure this makes any sense.. when you refer to an exhaust being "catted" or "catless", I'm pretty sure we are reffering to the down pipe... the muffler itself doesn't contain a cat.
3) Yes
4) Any 3" down pipe that you feel comfortable with
5) Pretty much any 3" downpipe should work

[KiTsuNe]

1. Price difference is pretty big, couple hundred dollars. Power not so much, main question to ask here is if it will pass emissions or not, if a catted one doesnt pass emissions anyways just save money and go catless.

2.the only cat in the STi are in the downpipe. Thus why its called cat back (from the catalistic converter back).

3. Eh sorta? Exhaust note is mainly your axle back ( could get louder if you dont have a resonator in your midpipe)

4. You're good with any of the cobb/helix/invidia/titek/maddad/turboxs downpipes for that. If you go rotated turbo then you have to get something else.

5. The style/catted or not do not effect the mating process between exhaust and downpipe.

[C.J.]

no downpipe, run straight hot side.

but ya I would say Invidia is a good route or if you can find them, I have a TiTek and it fits awesome and was around the same price.

[STINewbie]

Thank you very much for answers I understand a little more now.
There is still couple details that im confused about.

1) Is it legal to remove the stock downpipe, even if you replace it with a new catted downpipe, because i've heard that at that point it doesen't matter if you get a catted or catless, because it won't pass the emissions.
Is this correct?

2) As mentioned earlier to my question the main difference between downpipes is price&sound.
But what of these downpipes is best for future power upgrades bellmouth/uncatted, divorced, and high-flow catted.

3) kiTsuNe mentioned that I need a different downpipe if I get a rotated turbo.
What is a rotated turbo, because I am planning to change the turbo in the next couple years.

4) What is the difference between race cat, and normal cat ?

5) What is a catalytic converter

I think these questions are enough, before I get banned for being a total newbie

[KiTsuNe]

lets make this easier, do you have a messenger of some sort? PM me

[STINewbie]

PM sent

[WRX4ME LE 482]

Many people say you cannot tune out boost creep, but I believe if it's not too bad you should be able to. Especially if your goal is a higher target boost, and your turbo already has trouble hitting that mark.

If your goal is 17 psi and you flow like crazy I can see it being very difficult, however.

[supar6]

This is one of those times I'm actually happy I live in MN. No emissions testing!!!! Of course the way things work up here that could change any moment they get wind there's money to be made on ticketing and fee's.

So my question is this...

I don't care about $$$ that much although if all the same obvious the less I spend the more I have to spend somewhere else. I'd just like a little more sound other than the stock pipe. I've got an all stock '05 STi which I'd like to not get too crazy with as I have an extended warranty. I'd just like to get a new exhaust that sounds good and adds a little power. Personally I think they all sound kind of good so any recommendations is appreciated.

[STI-LOS]

Better question is Crawford DP or a Full Race DP???

[WRX4ME LE 482]

I would like a little more sound also. I love the way my car sounds completely stock, below about 2k rpms. It's a really nice deep rumble. My gf always hears me pulling into the parking lot at her work to pick her up for lunch before I even get around to that side of the building. Would be cool to increase this a little bit.

[Szumita]

invidia.

[STINewbie]

What's the difference between cat and race-cat ?

[Rain]

Regular cats are more restrictive as they have a more compact cell structure, race cats have a less restrictive cell structure.

EG:

[Chinky_Sti]

i have a invidia divorce catless i love it