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Old 10-25-2004, 09:22 PM   #1
Scooby Specialist
Member#: 53451
Join Date: Jan 2004
Location: Caribbean
2000 JDM Impreza SRX
w/ AVCS Silver

Smile HKS Carbon Ti for NA models

2000.9 Subaru Impreza GC8 SRX 2.0L w/ AVCS & Variable intake, Direct Ignition Automatic. in other words, think about the 2001+ WRX engine without the turbo. The setup looks the same.

Max.power (Net),kw(PS)/rpm
155 ps (114.00 kw) [152.88 HP] / 6400 rpm

20.0 kg*m (196.13 N*m) [144.64 ft-lb] / 3200 rpm

I purchased the HKS Carbon TI (31012-BA002) Muffler about 4 months ago.

After upgrading to a 2.25" piping from my full 4-2-1 straight header to the stock muffler, I noticed an improvement in revving and some torque.

I purchase the HKS TI due to the fact that it had good reviews in Turbo Magazine, when compared to others for the WRX and RS.

Now, if you are looking for that subaru distinct deep throbbing sound, forget about this exhaust. Get a greddy or something like that.

After putting the Ti on, the car had noticeable torque, alot of it I think, compare to stock and good hp. I know for sure that it is well over 205Nm. You can really feel the torque when the car shifts down. Night is even worst.

I plan to do a dyno run on a dyno, since my Gtech Competition Pro gives me something like:-

RR Version 4.0
104.1 HP @ 6366 RPM
96.6 ft-lbs @ 4580 RPM

This include drivetrain losses, air resistance, rolling resistance. A soup bowl of losses. (In fact, I am going to post this on Gtech site for and estimate on flywheel numbers.)

But it was loud. Very loud. I put in a Magnaflow resonator (10414) to quiet it down, which it did, but still loud. The subaru noise came through more pronounce, but still more was to be desired.

Magnaflow resonators offer a really deeper sound compares to others.

Last week, I added another Magnaflow resonator to get a deeper sound and to also get rid on the spitting noise of the HKS.

Man, when there started the car, it was quiet. I mean really quiet. @ cruising, you can barely hear the deep hum.

When I took the car for the drive, I have good low end torque and the car was even faster than before. Those resonators have a 2" internal, making me feel that the car would do good with a 2", but my top end would suffer.

One resonator in the middle of the car while the other is next to the diff.

I also installed a flex pipe to reduce stress on the system.

But one thing I like about this setup is that I now have a high pitch, turbo spooling noise, that just sound sweet when passing 4000rpm to a air plan ringing @ full throttle.

I was on the track yesterday and was surprised how loud this ringing was, that you can still hear it through the subaru deep sound, 50ft away from the action. Also, was able to pull some 1.2g around the corners, and that was conservatively driving, didn't want to hit the car since it fairly low to the ground

Everyone is asking if it turbocharged due to the sound and how fast it was going around the track. You see, there are 2 types on impreza here where I live:- 1.5L and the WRX.

I came up upon a Mini Cooper S and because I was an auto, he would move a bit in front of me, 2-3 car lengths, but I would start to reel him back in fairly slowly. I would say that if I a long road, I would have pass him.

My friend's dad recently got his 2004 Legacy 2.5 from Japan.

We had a like test yesterday. We were almost match, but the 2.0R (SRX) was starting to put away. I am not to sure if we had a longer road if I would have leave him completely, but we are almost match. I have 4EAT while he has a 5EAT w/ Sportshift. But I tell you, that wagon is sweet.
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Last edited by west_minist; 10-25-2004 at 11:26 PM.
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Old 10-25-2004, 09:47 PM   #2
Scooby Guru
Member#: 29355
Join Date: Nov 2002
Chapter/Region: NWIC
Location: seattle

awesome. great write up!

do you think you get more power with the HKS as oppossed to say, greddy?
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Old 10-25-2004, 09:51 PM   #3
Scooby Specialist
Member#: 53451
Join Date: Jan 2004
Location: Caribbean
2000 JDM Impreza SRX
w/ AVCS Silver


My conclusion are only base on Turbo and Sport Compact magazine.

One exhaust that did good over the HKS Hi power was the Kakimoto Exhaust, which is very expensive and hard to come by.

There are so many exhaust out there, but I like how the HKS barrel give me that stances.

Also, the Supra uses the HKS a lot, hence my interest in them.

If there is any magazine with any other reviews on mufflers or exhaust systems on the wrx and RS, please share them.

But if I had to get another exhaust, I would get the Greddy EVO2 (10166601), but the HKS comes # 1 for me. When I replace my 2L block witht the STI 2.5L block and turbocharge, I would go with the Full WRX HKS Carbo TI system. May also have to put in a Magnaflow resonator - just in case

Last edited by west_minist; 10-25-2004 at 11:20 PM.
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