does anyone have the ws2 cat-back? does anyone know the piping size for it? I've seen it on a few sites and it says 65mm-65mm-80mm / 100mm tip. Does this mean it starts out with 65? or is it 80mm all the way? 80mm is like 3inch correct?

 

From what your saying it look like your 65mm is a 3.25'' piping and 80mm is a 4'' pipe which is in between the connection to the mid pipe and the actuall exhuast.
and 100mm is a 5 in tip .

it seems about right . or it might be .25'' bigger than mine . i belive mines a 3'' to 4'' to 3'' and a 4.?? inch tip

 

^ so you have it?

how's the HP increase, sound, and all that?

 

65mm is roughtly 2.5"

http://mg-jewelry.com/mmtoinches.html

 

hmm, I wonder if someone has the exhaust and give a true measurement

 

yes sorry 65mm is around 2.5. sorry about that.

thanks for the correction

 

mines a 3'' from cat back the one you are looking at is a 2.5 ish.(its slightly bigger than 2.5 )


i have the Apexi gt spec . its a 3'' exhaust sound very deep but not annoying at all,it gives a very deep and aggresive tone while accelrating.

my hp increase is not too noticeable , b/c its only like a 10 hp ish increase. a 2.5 piping prob has a lower hp gain .

mine has a very deep tone at idel. but not loud at all. if you have a DP it will sound very aggresive.i mean very MEAN!!.

the subaru 4H engine has its own engine ''accent'' sounding very nice ,Sounds Nothing like a I4 engine. i bet who ever own a subaru with 3'' catback/turboback exhaust system would say it the best sounding 4cyl engine they have ever heard.

ill say go with a 3'' if your looking for a nice deep tone/ with more hp increase , but if your looking for a little louder go with the 2.5.

i say after a while you get used to the tone and sometimes u cant even hear the exhaust , its up to your so yeah.....

 

I do have the Apexi world sport II and it's not loud at all, it's around 95 decibels if not a bit higher. It has a nice rumble and gurgle once you break it in, overall I love my apexi wsII catback, the pro about this is it looks stock and you don't have to be worrying about the cops pulling u over cause it looks stock. I had this for about 4 months now and I can't think of any con. If you're looking for something not too loud go for this one, if you want something loud and aggressive I suggest go for the HKS carbon Ti catback, that will get u noticed.

 

Anyone know if I have to get EM for having:

Apexi World sport II
HKS Sequential blow off valve
AEM cold air intake

If so, anyone know a good place, I'm from the bay area.

 

EM?<whats that?

exhaust manifolds??