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Old 11-27-2010, 04:08 PM   #1
nasa779
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Default 2.5i catback, sway bar, and sti pinks questions

im trying to put together a parts list for when i actually pick my 2.5i 5 door up, and i have a few questions about what i want to do

goal: make it more fun but not a dedicated track car, keep it streetable

i want a different exhaust, ive been looking into the borla, http://www.autoanything.com/exhausts...0A3282117.aspx but i cant find any good video that gives me an idea of what i would hear, all im looking to do is get a slightly louder exhaust that isnt raspy and wont shift the powerband much higher up and id like to keep my low end tq. and what does droning mean "my cbe drones at 75mph"

ive also been looking into the perrin 19mm swaybar with endlinks and mountshttp://www.perrinperformance.com/pro...ry=77&model=32, it that sway too thick? now ive heard that there are fitment issues and small exhaust mods are required for installation, can anyone verify that?

lastly, i wanted to reduce the body roll a little and get some springs with a higher rate but i didnt really want to lower the car, so i heard pinks were the way to go, but i also heard i have to get sti tophats and struts to use the pinks, is that true? if they fit into the 2.5i's struts will they damage them in any way with the higher rate?
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Last edited by nasa779; 11-28-2010 at 09:55 PM.
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Old 11-29-2010, 01:09 PM   #2
c_thur
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I am curious, myself, about the rear sway bar. I spent lunch searching to find out more about the '11 2.5i. Seems not much changed, and it still lacks a factory rear bar? I didn't find out much about the stock front though.

Is it possible to add only a rear bar (modest 19~22mm), without changing the front, or would this result in too much snap oversteer?
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Old 11-29-2010, 02:30 PM   #3
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1. Exhausts aren't really worth the money unless you're going for sound, then by all means go for it. Search the NA powertrain forum for the "tsudo catback", someone had a video up and it's the best sounding exhaust without UEL headers.

Droning means the exhaust is so loud that it gets to be annoying at high speeds on the highway.

2. The rallitek 19 mm rsb is a perfect fit and gives just a little bit of oversteer compared to the massive amount of understeer our cars get for having no rear sway bar

3. STI pinks have been known to blow the stock 2.5i struts. You can't fit the STI struts onto your car so your next best option is to find a set of OEM 09, 10, or 11 (not 08) WRX struts. If you're made of money, you can dish it out for the new Bilsteins made for the GR chassis WRX made by GTWORX/RCE
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Old 11-29-2010, 06:44 PM   #4
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Quote:
Originally Posted by nairbmik View Post
1. Exhausts aren't really worth the money unless you're going for sound, then by all means go for it. Search the NA powertrain forum for the "tsudo catback", someone had a video up and it's the best sounding exhaust without UEL headers.

Droning means the exhaust is so loud that it gets to be annoying at high speeds on the highway.

2. The rallitek 19 mm rsb is a perfect fit and gives just a little bit of oversteer compared to the massive amount of understeer our cars get for having no rear sway bar

3. STI pinks have been known to blow the stock 2.5i struts. You can't fit the STI struts onto your car so your next best option is to find a set of OEM 09, 10, or 11 (not 08) WRX struts. If you're made of money, you can dish it out for the new Bilsteins made for the GR chassis WRX made by GTWORX/RCE
i just youtubed the tsudo and it sounds awesome which i like because i cant find a borla clip of a 2.5i
is the tsudo a knockoff or is it the real thing, because im willing to pay and i dont care about power improvements, as long as it doesnt shift the powerband too high up

link to one? i cant find one for sale for a 08+ 2.5i

will the rallitek give me exhaust clearance? because the perrin has those block mounts that push the bar down and hopefully out of the way

as far as springs, my only goal is to really reduce body roll and make the car more fun in the twistys, but im not going crazy with the suspension like buying coilovers

Last edited by nasa779; 11-29-2010 at 06:57 PM.
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Old 11-29-2010, 07:27 PM   #5
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Yes the rallitek rear sway bar is made for the 2.5i models

Without proper set up, springs won't really do much. Some springs may even end up making your handling worse
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Old 11-29-2010, 07:36 PM   #6
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from what ive read the tsudo sounds good but the piping is way to big and theyres a big loss in low end torque, which i dont want, granted $800 for an exhaust is pretty damn expensive, but if it will give me the sound i like with minimal low end power loss and a lifetime warranty, im willing to pay for it, but id like to find something cheaper if i can
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Old 11-30-2010, 04:15 PM   #7
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If all you really want is sound then you could pick up a used WRX cat-back for cheap and then swap the muffler for something that sounds better. I don't have any suggestions there, but if all you really want is better sound, then you shouldn't have to dump $800 on exhaust.

Any rear sway bar for an 08+ Impreza (WRX, OBS, 2.5i and STI) will fit. They are, pretty much all the same in the back. Fronts are different though. You need a front bar specific to the NA Imprezas, or you need to "modify" your exhaust (squash it a bit flat in just the right spot so that it doesn't interfere).

If you search around you should be able to find some low-mileage 09+ OEM WRX Struts and top-hats for a decent price. That would give you what you need to support your STI springs. Rallitek seems to list the same springs regardless of the model, but I haven't seen or hear dof anyone who has them on an NA car with OEM struts for a long period of time. I'm thinking about being the guinea pig for that, we'll see what Santa brings me.
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Old 11-30-2010, 06:05 PM   #8
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^ I've been saving up to get a set of OEM struts, I'll try to remember to do an update if I ever get around to it.

On the other hand if someone is willing to spot me $1300 I can get those beautiful GTWORX bilsteins
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Old 11-30-2010, 07:25 PM   #9
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Originally Posted by Ogden View Post
If all you really want is sound then you could pick up a used WRX cat-back for cheap and then swap the muffler for something that sounds better. I don't have any suggestions there, but if all you really want is better sound, then you shouldn't have to dump $800 on exhaust.

Any rear sway bar for an 08+ Impreza (WRX, OBS, 2.5i and STI) will fit. They are, pretty much all the same in the back. Fronts are different though. You need a front bar specific to the NA Imprezas, or you need to "modify" your exhaust (squash it a bit flat in just the right spot so that it doesn't interfere).

If you search around you should be able to find some low-mileage 09+ OEM WRX Struts and top-hats for a decent price. That would give you what you need to support your STI springs. Rallitek seems to list the same springs regardless of the model, but I haven't seen or hear dof anyone who has them on an NA car with OEM struts for a long period of time. I'm thinking about being the guinea pig for that, we'll see what Santa brings me.
well would theyre be a huge difference in low end torque if im bolting on a 3 inch wrx catback? a friend of mine said it wouldnt be noticable because most of the backpressure is held by the cat....
and would i really need to even get springs if im just looking for a little less bodyroll out of the car
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Old 11-30-2010, 08:03 PM   #10
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Thicker sways will take care of your bodyroll problems.
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Old 11-30-2010, 08:49 PM   #11
nasa779
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Thicker sways will take care of your bodyroll problems.
would that affect winter driving at all? for instance handling in snow?
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Old 12-01-2010, 02:00 PM   #12
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Originally Posted by nasa779 View Post
would that affect winter driving at all? for instance handling in snow?
I can't think of how it would be detrimental to winter driving. It should be beneficial to overall handling.

That said, they are less likely to come into play in snow at all, because you're less likely to be cornering at high speed if there is snow and ice on the ground, so body roll is already minimized. For emergency manuevering, they should help just as they would in any driving conditions. Whether you have traction or not will be a much bigger factor.

And in the vein, the biggest factor for snow handling is your tires. That should be the first thing you change if you are concerned about snow.

Many would say that good tires are the first thing you should upgrade if you are concerned about handling, in general. The best suspension in the world doesn't matter at all if you can't keep the car stuck to the ground.
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Old 12-03-2010, 07:26 PM   #13
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i just figured softer suspension would be better on snow
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Old 12-12-2010, 12:04 AM   #14
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Quote:
Originally Posted by Ogden

I can't think of how it would be detrimental to winter driving. It should be beneficial to overall handling.

That said, they are less likely to come into play in snow at all, because you're less likely to be cornering at high speed if there is snow and ice on the ground, so body roll is already minimized. For emergency manuevering, they should help just as they would in any driving conditions. Whether you have traction or not will be a much bigger factor.

And in the vein, the biggest factor for snow handling is your tires. That should be the first thing you change if you are concerned about snow.

Many would say that good tires are the first thing you should upgrade if you are concerned about handling, in general. The best suspension in the world doesn't matter at all if you can't keep the car stuck to the ground.
I'm not sure about the specific case of snow, but the only drawback I've been able to identify in reading about sway bars is that it makes going over uneven terrain more uncomfortable.
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Old 12-12-2010, 10:01 AM   #15
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I'm not sure about the specific case of snow, but the only drawback I've been able to identify in reading about sway bars is that it makes going over uneven terrain more uncomfortable.
Possibly, but with the limited clearance that we have, I don't think it's a problem because we can't really take on much in the way of uneven terrain. For me, as 99.99% of my driving is on paved streets, it's a benefit to handling that is well worth the investment.
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Old 12-14-2010, 04:44 PM   #16
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Possibly, but with the limited clearance that we have, I don't think it's a problem because we can't really take on much in the way of uneven terrain. For me, as 99.99% of my driving is on paved streets, it's a benefit to handling that is well worth the investment.
I call bull****... I was in boston a couple of months ago. You've got plenty of "uneven terrain" to worry about.

Seriously though, I'm with you on this. I was just trying to point out the one possible trade off I had seen, which wouldn't really affect those of us that don't really plan on taking it off road very often, if at all.
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