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Old 06-25-2002, 07:51 AM   #1
2sour4u
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Question A few questions about MRT performance

I'm thinking about buying from MRT, but first I have some questions.

1) Do I have to order directly from Australia or can I get my stuff shipped from some place closer?If not, how much will it cost me to get it shipped over here to PA.
2)How do I convert from Australian dollars to American?
3)Is it worth it to go all out and get the Front engine pipe, Centre pipe, and muffler?

That is all, any help will be greatly appreciated!
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Old 06-25-2002, 09:27 AM   #2
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There are several distributers in the US for MRT. You won't have to get them from Australia.

I would contact Langston Subaru to buy MRT products.

If you want to convert any currency, you can use a search engine to find "currency converter" and you will find many places to convert currency. I use www.xe.com, they are updated continusly.

cheeRS,

Greg
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Old 06-25-2002, 09:31 AM   #3
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Oh, and for the $500.00+ you'll spend, there isnt really a better mod for your engine. Far from a waste. Be aware that it is mild steel and it isn't as corrosion resistent as stainless. Members have reported that it does fairly well in winter (snowy areas, with salt use). I would assume that this is as long as the paint is intact.

cheeRS,

Greg
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Old 06-25-2002, 09:39 AM   #4
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Old 06-25-2002, 10:19 AM   #5
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http://www.subaruwrxparts.com/

it's exeter subaru. They have a great reputation w/ the nesic guys. And they are on the board in some form or another.
AO
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Old 06-25-2002, 10:30 AM   #6
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Please, someone tell me where the front O2 sensor mounts in the NA header. I've asked many times but no one's fessing up.
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Old 06-25-2002, 10:46 AM   #7
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I got my MTR/White Line stuff from these guys. The price was right and they were helpful. I understand they are the largest distributor of MTR parts in the states.
www.4subaruparts.com
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Old 06-25-2002, 11:09 AM   #8
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if you look at this picture, you can see on the right hand side, just below the cross pipe, is a hole, that's where the front 02 goes.
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Old 06-25-2002, 12:47 PM   #9
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Quote:
Originally posted by m750
http://www.subaruwrxparts.com/

it's exeter subaru. They have a great reputation w/ the nesic guys. And they are on the board in some form or another.
AO
yes, exeter is a great place to do business with. i'm in FL, and wouldn't hesitate to buy again from them for a second. i had a problem with the pads from my big brake kit, and mike sent out new ones the next day, no questions asked.

-adam-
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Old 06-25-2002, 01:18 PM   #10
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M750, thank you!!
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Old 06-25-2002, 01:35 PM   #11
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just a note...
the headers shown, are modified from how you get them from MRT.
They've had the cat removed, and a flange added, as well as jet hot, or similar thermal coating. So, they don't 100% represent what you'll be getting if you buy the MRT stuff, it's about another $200 to have all that stuff done.
AO
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Old 06-25-2002, 01:48 PM   #12
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Pickup is an option if he ordered from Langston. They are only 4 hours away. If anything shipping would be much cheaper.
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Old 06-25-2002, 04:12 PM   #13
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Exclamation THANKS!

Wow, thank-you all! You guys solved alot of my questions. Did not know there where other distributors in the U.S. Just one more question...Does anyone know if there exhausts are loud? I mean do they have a nice rumble to them?
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Old 06-25-2002, 05:13 PM   #14
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I just ordered the only one Exeter Subaru had. I'm sure they'll get some more in the near future, and Langston should be getting in their batch of headers (5 sets if I remember correctly) really soon. It's wierd that Langston gave me an estimate of $505 + shipping when I've heard different prices from different people who talked with Langston. I just couldn't wait any longer, so I went with the dual tip from Exeter. Just what I wanted in the first place! Besides, this is the quietest performance, full exhaust system around and great bang for the buck.

Before I forget, on that MRT Dyno that showed the stock hp/torque and the MRT hp/torque... it's strange that both the HP and torque criss-crosses each other on both systems at the same rpm #. Looks like the Cobb cams will change that.

Last edited by kickin_81; 06-25-2002 at 05:26 PM.
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Old 06-25-2002, 06:11 PM   #15
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So what your saying is that MRT exhaust isnt very loud? Because I'm looking for an exhaust with a little rumble. Something that when it drove past you, you knew it had aftermarket exhaust on it.
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Old 06-25-2002, 07:39 PM   #16
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Quote:
Originally posted by kickin_81
Before I forget, on that MRT Dyno that showed the stock hp/torque and the MRT hp/torque... it's strange that both the HP and torque criss-crosses each other on both systems at the same rpm #. Looks like the Cobb cams will change that.

Did the lines cross at around 5252 RPM? 'Cause...

Torque = HP @ 5252 RPM.

No matter what motor it is.

NC
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Old 06-25-2002, 08:06 PM   #17
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Not to get off the subject or anything, but is the MRT exhaust at all loud.
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Old 06-25-2002, 08:08 PM   #18
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2sour, the sound level is all about the can.

Personally I don't like the way the MRT stock can sounds. But it can easily be replaced with another can of your liking, one that will be as loud or as quiet as you please.

NC
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Old 06-26-2002, 09:13 AM   #19
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Quote:
Originally posted by dcrawford



Did the lines cross at around 5252 RPM? 'Cause...

Torque = HP @ 5252 RPM.

No matter what motor it is.

NC
Are you sure? So what if you put cams in... would it increase the torque band more since the hp band is really stretched? I've never read that before.
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Old 06-26-2002, 09:48 AM   #20
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Actually,

T = (HP x 5252)/RPM

Where 5252 is a constant.

More appropriately, engine power should be given in kilowatts (i.e. european standard) since a motor's speed will generate an respective voltage in a wound wire... a Watt is 1 amp across a potential difference of 1 volt. When calculating HP you need to account for the efficiency of the motor, which none of us have readily avaiable but it is relatively easy to hook up a generator to the crank shaft.

HP = (V x I x Eff)/746 where V=volts, I=current,Eff=efficiency,746=constant

OR

1 HP = 746 Watts, or 550 Ft-Lbs/sec


edit:
Why wont this thing let me line up the equations
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Old 06-26-2002, 11:18 AM   #21
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The MRT system is not loud. At large applications of throttle, it is distinctive from stock, but at idle/on the freeway, it is as quiet as stock.

Any back box spec'ed to fit the stock GC8 will fit to the back of the MRT system, so you can change the sound as you like. I'd love to hear an MRT/Scoobysport combo, but have no desire for it to be on my daily driver.

I do chirp alarms in the parking lot with the MRT system, but it still isn't that loud.

JS
That's my header in the pic posted by AO.
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Old 06-26-2002, 11:43 AM   #22
Reciprocity
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Quote:
Originally posted by BOY
Actually,

T = (HP x 5252)/RPM

Where 5252 is a constant.

More appropriately, engine power should be given in kilowatts (i.e. european standard) since a motor's speed will generate an respective voltage in a wound wire... a Watt is 1 amp across a potential difference of 1 volt. When calculating HP you need to account for the efficiency of the motor, which none of us have readily avaiable but it is relatively easy to hook up a generator to the crank shaft.

HP = (V x I x Eff)/746 where V=volts, I=current,Eff=efficiency,746=constant

OR

1 HP = 746 Watts, or 550 Ft-Lbs/sec


edit:
Why wont this thing let me line up the equations
Ah yes...the elegant answer. Seriously though, on "our" standard dynographs the HP and TQ curves will cross at 5252 RPM, correct?

Edit: some examples

http://www.evosport.com/images/produ...t/ss/e46M3.gif

http://www.ls1motorsports.com/images...dyno_graph.JPG

http://www.shakti-innovations.com/im...ograph1asm.jpg

NC

Last edited by Reciprocity; 06-26-2002 at 11:53 AM.
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Old 06-26-2002, 12:46 PM   #23
BOY
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Oops, I didn't realize that this was an LS1 forum.

from a ford 5.4l engine

stock imprezaRS

Cobb dyno chart

The hp and torque curves don't necessarily cross at a given RPM. 5252 is a constant used to convert from torque to HP, kind of like "g" for gravitational calculations... it just is.
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Old 06-26-2002, 12:59 PM   #24
Reciprocity
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Quote:
Originally posted by BOY
Oops, I didn't realize that this was an LS1 forum.

The hp and torque curves don't necessarily cross at a given RPM. 5252 is a constant used to convert from torque to HP, kind of like "g" for gravitational calculations... it just is.
I hear ya... And as far as the dyno graphs I picked, just random ones from google.

NC
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Old 06-26-2002, 02:25 PM   #25
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No worries... back on topic...

You will lose low end performance with virtually all performance mods but you will gain better breathing and top end. Since HP is directly proportional to rpm, expect the curves to cross higher up the rev range. As for Cobb cams, depends on which ones. I've got the street performers with a custom header and the powerband feels very close to stock (just gobs more of it ). The stageII cams are designed for a higher reving, better breathing head. I've driven them on the stock heads and once you hit ~3000-3500 its like you're driving a WRX (and similarly, below 3k it is gutless and slow) but you are still increasing power when you slam into the fuel cut. On equally modified cars (with stock heads/rpm range) the stage II's may make slightly higher peak numbers but overall performance is about equal. The headers, regardless of type, will aid in the engine's ability to breathe, thus allowing it to make more power. The MRT disign is very indicitave of a V8 header, using virtually equal length tubing and benifitting from exhaust gas scavenging. The Borla's look good and sound good but there disign leaves much to be desired for maximum power. Remember though, the Borlas are designed to work with the stock cats, the MRT's are not. Apples and oranges I say.
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