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Old 08-01-2010, 01:30 PM   #1
ketchupfreak
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Yimi Tuned 291hp/320tq

Default CNT catted downpipe and CNT STI quad catback exhaust for 2009 WRX

Edit! New vid

Hey there, I just wanted to give my opinion on the CNT (formerly known as ERZ) downpipe and new catback. Originally, I had the cnt downpipe mated to a Perrin catback which fit perfectly and sounded pretty good, but I really wanted more sound and something more unique. I saw that CNT was coming out with a new, affordable STI quad tipped catback so I jumped on the chance to pick that up.

With that being said, I do have a WRX and not an STI so the rear diffuser had to be cut on both sides to accept the quad tips. I DIY'ed the install and the hardest part was really cutting out the diffuser. I used a heavy duty xacto knife and just masked off the area I wanted to cut. I did take off the bumper which is just 8 push clips. Everything mounted up perfectly seeing how the STI has the same mounting points as the WRX. I also picked up new PU hangers from Paranoid fabrications.

The build quality of the CNT catback was amazing for the price. I could have easily spent upwards of 1k for a Mackin or HKS quad exhaust but I took my chances by spending less than half that for the CNT.

As far as how it sounds, I'll let my video clip do the talking.




Let me know if you have any questions. I'll be happy to answer them.
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Last edited by ketchupfreak; 08-13-2010 at 01:18 PM.
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Old 08-01-2010, 01:44 PM   #2
dnyet
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Did you ever use the DP with the stock catback? If so, what gaskets or any thing special did you need for the install. Did it mate up good to the stock mid pipe or did you need a flange or gasket to mate up to the doughnut on the mid pipe?
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Old 08-01-2010, 01:55 PM   #3
ketchupfreak
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Quote:
Originally Posted by dnyet View Post
Did you ever use the DP with the stock catback? If so, what gaskets or any thing special did you need for the install. Did it mate up good to the stock mid pipe or did you need a flange or gasket to mate up to the doughnut on the mid pipe?
No I didnt. I think you can use the donut gasket to make it work or get an adapter.
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Old 08-03-2010, 06:58 PM   #4
ERZperformance
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a Exhaust made for a STI on a WRX , wow looks good
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1-800-363-8599 M-F 10-5 pacific Standard Time
Warehouse Distributor for CNT Racing and Tsudo performance.
Best regards
Thomas

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Old 08-04-2010, 05:55 AM   #5
Rob Cook
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Quote:
Originally Posted by ketchupfreak View Post
No I didnt. I think you can use the donut gasket to make it work or get an adapter.
well i don't think this will be better with the donut gasket. i have thats in my 2005, but not went good at all.
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Old 08-05-2010, 12:12 AM   #6
ERZperformance
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I was able to use this exhaust with a OEM donut gasket and matted with a OEM downpipe
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1-800-363-8599 M-F 10-5 pacific Standard Time
Warehouse Distributor for CNT Racing and Tsudo performance.
Best regards
Thomas

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Old 08-05-2010, 07:02 PM   #7
ERZperformance
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1-800-363-8599 M-F 10-5 pacific Standard Time
Warehouse Distributor for CNT Racing and Tsudo performance.
Best regards
Thomas

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Old 08-08-2010, 07:05 PM   #8
GREY08WRX
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Quote:
Originally Posted by dnyet View Post
Did you ever use the DP with the stock catback? If so, what gaskets or any thing special did you need for the install. Did it mate up good to the stock mid pipe or did you need a flange or gasket to mate up to the doughnut on the mid pipe?
i have the cnt downpipe with factory catback used gasket that came with downpipe and it leaked so i used some copper rtv and it sealed it right up. Not to happy with the way it mounts to the turbo though.
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Old 08-08-2010, 11:35 PM   #9
ERZperformance
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Quote:
Originally Posted by GREY08WRX View Post
i have the cnt downpipe with factory catback used gasket that came with downpipe and it leaked so i used some copper rtv and it sealed it right up. Not to happy with the way it mounts to the turbo though.
if you have a stock exhaust the gasket CNT racing included will not work those are for full 3 inch catback exhaust system. If you have a OEM exhaust you just reuse your OEM O gasket and not the gasket CNT racing include.
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1-800-363-8599 M-F 10-5 pacific Standard Time
Warehouse Distributor for CNT Racing and Tsudo performance.
Best regards
Thomas

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Old 08-13-2010, 01:17 PM   #10
ketchupfreak
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Take off and drive by video.
Yes..I drove up to 40 mph in my neighborhood. Sue me.

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Old 09-27-2010, 07:45 PM   #11
silver arrow
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I just got a CNT catless downpipe today and will be installing soon with the stock STI CB. I'll let you all know how it fits and how it sounds.

First impressions are good. Weld at the bottom flange looks very good, the weld at the cast bellmouth is passable. Looks well made.

I eventually plan on welding in a high flow cat in the second cat position.
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Old 09-30-2010, 02:54 AM   #12
turbospeed
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Nice work! you have inspired me to want to do this. Can you give me some pointers to make this easier or things you would do differently

thanks
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Old 09-30-2010, 09:34 AM   #13
kevin 5150
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i have the CNT catted DP mounted up to the stock cat-back. i got the adapter piece as well. used gasket in between DP and adapter and then a donut between adapter and stock exhaust. i am really happy with it. the sound hardly changed at all and that i like. and have already got it tuned and on the dyno. 270whp and 303wtq. very happy with those numbers.
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Old 09-30-2010, 02:05 PM   #14
silver arrow
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Quote:
Originally Posted by kevin 5150 View Post
i have the CNT catted DP mounted up to the stock cat-back. i got the adapter piece as well. used gasket in between DP and adapter and then a donut between adapter and stock exhaust. i am really happy with it. the sound hardly changed at all and that i like. and have already got it tuned and on the dyno. 270whp and 303wtq. very happy with those numbers.
What did it do in stock on the dyno?
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Old 10-01-2010, 12:05 AM   #15
kevin 5150
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Quote:
Originally Posted by silver arrow View Post
What did it do in stock on the dyno?
that i can't tell you. never had it on the dyno when it was stock. my neighbor has an '09 as well, with the same build month as mine, and i'm going to try and get his car to the dyno. will be interested to see what his car runs. just to see if the DP and tune really did that much to my car. hope to have an update on that in the next couple of weeks.
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Old 10-08-2010, 01:24 AM   #16
lando
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Just installed this on my 2010 STI. Installed was pretty straight forward. You DO NOT need the kartboy extended hangars. Well, I used one on the long pipe, which is unbelievably hard to get on. Looks really good and sounds awesome. Still awaiting the DP which is about a week out.

Happy with the purchase.
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Old 10-13-2010, 01:34 PM   #17
bzbuzz
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looks good and fair price... more reviews!!!!!!!!!!
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Old 10-13-2010, 02:37 PM   #18
silver arrow
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Just installed the CNT catless 3" with the non divided bellmouth. The welds around the piping to bellmouth looked passable, but not great. They inside of the bellmouth had some serious flashing and wasn't very smooth where they are welded together. The welds on the bottom flanged looked good and the flange itself is nice.

I wrapped the pipe down to the transmission mount with heat wrap and modified the stock heat shield to fit.

The DP fit with very little effort, just keep everything loose until you get all the bolts started.

I am using the factory 08 STI catback and it went together fine with the factory donut and I have no leaks.

After adjusting the tune, the car had much less lag than stock, but it still has far more lag than I expected. My previous 05 STi used a Scooby Sport shorty bellmouth into the factory cat and was much less laggy. I think this is due to the flashing inside the bellmouth, gap at the bellmouth to piping weld, and the 3" to 2.5" inch transition at the factory catback, as the Scooby Sport was a bellmouth to 2.5" which matched the factory cat.

I will update when I get a smoother 3" - 2.5" adapter in there to see if that helped.
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Old 10-17-2010, 08:16 PM   #19
bzbuzz
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bump for more reviews...i am debating this or Magnaflow catback...
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Old 10-18-2010, 12:18 AM   #20
mark729
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yes we need more review and installed picture!!!!!!!!!!
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Old 10-18-2010, 07:24 AM   #21
ERZperformance
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Here you go



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1-800-363-8599 M-F 10-5 pacific Standard Time
Warehouse Distributor for CNT Racing and Tsudo performance.
Best regards
Thomas

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Old 10-23-2010, 12:09 AM   #22
ViperOne99
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Anyone know if this will fit the 2011 wrx?
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Old 10-24-2010, 07:58 PM   #23
Lboogie
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yes, and you don't have to modify the rear bumper on the 2011 wrx's.
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Old 11-05-2010, 02:49 PM   #24
SWP n Gold
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Does the CNT catted downpipe neck down to 2.5" at all or is it 100% 3"?
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Old 11-05-2010, 03:58 PM   #25
ERZperformance
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Quote:
Originally Posted by SWP n Gold View Post
Does the CNT catted downpipe neck down to 2.5" at all or is it 100% 3"?
it's full 3 inch flange.
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Warehouse Distributor for CNT Racing and Tsudo performance.
Best regards
Thomas

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