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Old 11-17-2003, 04:03 PM   #1
rwarring
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Default Tech Works Engineering Inc.

About the Reviewer

I’ve been following this site off and on for the past 3 years. My past experience comes from 5 years of Formula SAE design and 2 years of Solo II in Calgary. This past Solo II season I was sponsored by TechWorks Engineering Inc. (TWE) in a bid to win the Canadian National Autoslalom Championships (CNAC). In August I finished 2nd at the CNAC in D Super Stock and definitely attribute that success to the help that I received from TWE.

I’ve been running TWE components on my car for the last year in various configurations. I have run the High Output Cat Section, Mid-Pipe, Stainless Steel Muffler Section, and Carbon Fiber Tip with a modified Version 2 Superstock Header.

Additionally the car is setup for Autocross with the P1/KYB suspension, STi Strut Mounts, FHI 20mm Rear Sway Bar, Whiteline Sway Bar Mounts and Endlinks, and Kumho Victoracer Tires on the stock wheels. This is a well prepared car for CNAC DSS (although still requiring refinement), but would be considered under prepared for STS.

Header Review

The TWE Superstock Header is an equal length 4 into 1 header with the primary pipes tuned to produce power within the stock rev-limit of the car. Since the stock start and end points for the header are maintained, the primary tubes twist to reach their endpoints at the merge collector. This compromise has caused minimal interference with my sub-frame which was hardly noticeable until I installed a front strut tower brace.

With the car configured with the complete exhaust system from TWE, there is a noticeable power gain throughout the power band. What is most noticeable is that the car pulls to redline without any hint of peaking, indicating that I should raise the rev-limit to take advantage of further power. From 4000 rpm to 6200 rpm the added throttle response enhances the drivability of the car on a Solo II course. For CNAC, the stock air filter housing was removed and an oversized K&N cone filter was attached directly to the throttle body. The improvement from this last minute modification was dramatic and continued to draw more power from the exhaust modifications.

The car that I lost to at CNAC was a 2001 VW GTI 1.8T chipped to 220Hp. This leads me to suspect that my Impreza is making about 190 Hp. This was somewhat confirmed with a 16.5 s ¼ mile time at Calgary’s Race City Motorsports Park, where a stock 2.5RS runs in the mid to high 17s.

Since the end of the Solo II season the stock exhaust was reinstalled for a comparison, and at first glance was not bad for city driving. When giving the car more throttle, the response was much slower that with the TWE setup. Currently the car is stock with the TWE header in place, and again there is a noticeable improvement in throttle response.

I have tried the following combinations of the TWE exhaust components with the remainder of the system stock for periods of at least 4 weeks at a time:
• muffler section & mid-pipe
• muffler section, mid-pipe & header
• muffler section, mid-pipe, cat section & header
• muffler section, mid-pipe, cat section, header & cone filter
• header

Replacement of any of the stock components enhances the response of the motor, however the car never really breaths easy until the header is involved in the system. I will continue to run the header alone for this winter unless I am involved in further component testing as I feel that it is the best compromise for daily street use/comfort.

I’m sure that I have left out details that may be of interest to the board, so please feel free to ask me about anything TWE that I have posted here.

Sincerely,

Ryan Warrington.
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Old 11-23-2003, 01:56 PM   #2
inpreza kid
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intresting review. i've talked to the twe guys before in the past. do you have any plans on running their cams/head setup?
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Old 11-28-2003, 02:04 AM   #3
Paul Sakai
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Thanks for the review. I am very interested in the cams/head setup also, especially after reading the thread in this forum about Cobb's cams.
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Old 11-28-2003, 03:06 PM   #4
rwarring
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Hi Guys,

I haven't decided which direction I will be taking the car in the next year. Since the primary reason for developing the car is for Solo II, I have to wait until the new rules come out in January. If there are sufficient advantages to move to Street Prepared then the engine will see a full rebuild of the top and bottom ends.

I plan to use TWE for any engine building in the future.

Ryan.
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Old 11-28-2003, 03:16 PM   #5
Jejunum
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silly question whats the sound like (of the header)?
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Old 11-28-2003, 06:23 PM   #6
rwarring
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You can hear the exhaust note in this video clip.

The header and the high flow cat-back are installed.

Ryan.

TWE_AutoX_Start
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Old 11-28-2003, 11:46 PM   #7
Jejunum
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Quote:
Originally posted by rwarring
You can hear the exhaust note in this video clip.

The header and the high flow cat-back are installed.

Ryan.

TWE_AutoX_Start
now howabout some more videos of you autoxing


any idea on fitment issues of the TWE headers on an AUTO 02 RS?
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Old 11-29-2003, 04:45 PM   #8
rwarring
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Jejunum,

I don't have any experience with the ‘02 Autos (let alone the earlier Autos). Can you post an underbody shot of the engine bay (from a lift)?

Thanks,

Ryan.
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Old 05-30-2004, 07:33 PM   #9
mr. m
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does anybody else have a review of this?
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Old 09-21-2004, 09:36 AM   #10
ShawnRS
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I have TWE SS (not stainless Steel) headers. There were the first componet I installed, exhaust wise. They seemed to smooth out the power band with a bit more of umph up top. Lost some of the rumble.

They do hang low so keep this in mind if you do any gravel. I've hit a couple times. I have a nice dent in the low hanging pipe. I am having a custom skid plate made.

Not recommend for heat wrapping.
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