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Old 02-02-2008, 01:31 PM   #1
onebaddx
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Default Attaching a STI Catback to a 98 Forester....need some help.

Alright, so I've had my Forester now for about 2 months. In the first 40 miles of driving it I had the engine tore down and rebuilt due to 2 bent exhaust valves (yay/not). Now that she's all back up and running well I've had a goal of 30mpg on average with this beast and know I can hit it with my commute to work (85 miles 1 way) and driving it like a Forester should be. So I've picked up some Phenolic Intake manifold spacers, looking into the T/B Spacer and also a cheapy Intake as well. But I just got a great deal on a full STI catback exhaust so I picked it up!!

Now I've been searching for 2 days of a write up or install of an STI exhaust on a SF chassis Forester or even an Impreza as they are the same pretty much and have yet to find anything!! BTW, the search function on this site is awful lol.

So I'm looking for any threads that may pertain to my install on what needs to be modded, I have a general idea on what I have to do but would like some hard evidence to review as well.

Also, any suggestions to an intake for a MAF equiped Subaru would be great as well.

Thank you,

Nick.
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Old 02-03-2008, 09:35 AM   #2
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I thought this site was supposed to be the all mighty Subaru information site? I cant get any input on a question?
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Old 02-03-2008, 10:11 AM   #3
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Try this site they are dedicated to the forester.
http://www.subaruforester.org
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Old 02-03-2008, 12:32 PM   #4
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Did you pull the Forester exhaust off and put the STi exhaust up to see for yourself what needed to be done? At least comparing the 2 side by side would be a pretty good indicator in learning what needs changed.....especially if you didn't get your answer in the 20hrs between posts.

Jay Storm
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Old 02-03-2008, 02:18 PM   #5
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the search function works great for me, but i did notice that i only get accurate results when i use the advanced search and highlight a specific category to serach in... example highlight "N/A Powertrain" instead of "NASIOC Technical" if you are looking for something peratining to N/A engine. If you serach "All Open Forums" it takes a while longer and usually gives a bunch of crap that doesnt help you and only a few that have the information you are looking for. Maybe that will help for future searches.
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Old 02-03-2008, 03:17 PM   #6
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Subaruforester.org has some insight but this chassis is more closely related to an Impreza and figured I'd find more on here.

Also, searched on rs25.com with no help soo far.

Funny how I call out this site and all of a sudden I get replies to my thread :hammer:
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Old 02-03-2008, 03:37 PM   #7
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Here is what you do, and what most of us do for STI/WRX axlebacks/catbacks:

Take car to Exhaust shop with said catback.
Tell them to do what needs to be done to install it (in this case, extend the midpipe)
Bring ~$40-80, and pay them.
Done.
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Old 02-03-2008, 05:24 PM   #8
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Understandable but what about parts needed that they might not have on hand? New bolts with springs, 2.5 donut gasket etc....
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Old 02-03-2008, 05:51 PM   #9
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They have everything required, and can make anything needed.
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Old 02-03-2008, 07:07 PM   #10
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So they are going to have the Kartboy extended hangers for an uber clean install?
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Old 02-03-2008, 11:12 PM   #11
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Quote:
Originally Posted by onebaddx View Post
So they are going to have the Kartboy extended hangers for an uber clean install?
They can extend the hangars physically if you want them too.
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Old 02-04-2008, 12:02 AM   #12
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The extended hangers are for aftermarket exhaust systems anyway...if they need to move the muffler down, they'll just reweld the hanger. You may need to extend the tip to clear the bumper and/or extend the pipe on the axleback...sometimes that's what happens w/ wagon/hatch installs...
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Old 02-06-2008, 09:38 AM   #13
onebaddx
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Also, one more thing....

What is the diameter of the mid pipe? I recently was told it was a 2.25 mid pipe then the axle back is 2.5 inch. I cant measure it as I dont have a measuring tape handy nor am I at the house.

Thanks.
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Old 02-06-2008, 11:36 PM   #14
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They are in metric measurements, not standard.
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Old 02-06-2008, 11:44 PM   #15
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Quote:
Originally Posted by onebaddx View Post
Also, any suggestions to an intake for a MAF equiped Subaru would be great as well.
for an intake i just modified the stock intake and put a large K&N cone on it. It works and sounds great.

Last edited by JustinJS; 02-07-2008 at 05:03 PM.
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Old 02-07-2008, 01:48 AM   #16
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Quote:
Originally Posted by JustinJS View Post
for an intake i just modified the stock intake and put a large K&N cone on it. It works and sounds great.
What????

Anyways, to the OP - I believe it's all 2 3/8ths piping. My install cost a bit more because I have a longer vehicle and they had to do some serious welding, but it's nothing a shop cannot handle. They'll have all the parts needed, flanges, gaskets, etc.
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Old 02-11-2008, 10:42 AM   #17
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edited for the kiddies.

Last edited by onebaddx; 02-11-2008 at 02:06 PM.
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Old 02-11-2008, 10:43 AM   #18
onebaddx
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Quote:
Originally Posted by JustinJS View Post
for an intake i just modified the stock intake and put a large K&N cone on it. It works and sounds great.
What intake pipe is that? 96 outback?
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Old 02-11-2008, 11:47 AM   #19
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Quote:
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What intake pipe is that? 96 outback?
96' impreza so pretty much the same thing i have an EJ22
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Old 02-11-2008, 02:07 PM   #20
onebaddx
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Thank you JustinJS, I'm going to hunt for one right now and see what I can come up with.
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Old 02-11-2008, 08:47 PM   #21
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check out cozmo racing intake too they make them for all NA subaru
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Old 02-15-2008, 10:13 AM   #22
onebaddx
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Yes either a Cozmo intake or an Injen CAI, got a lead on one for $75 shipped. I'm begining to really like Subaru's lol.
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Old 03-10-2008, 02:29 PM   #23
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Ok, so I got sick of waiting around for the rest of my parts to show up for my Dyno day so I said F**k it and made an appointment for the catback to be installed on "Teh Foz". So after 40 minutes of hacking/slashing (not really at all lol) the STI catback was installed and cleared my bumper better than the OEM piece (which was pathetic).

Mods needed to do the job cheap and inexpensively?

When you remove your Mid pipe, cut off the flange that attaches to your stock cat pipe to flair and weld onto the STI mid pipe. Makes life much easier as it matches right up (dimension wise) and also just has to be rotated and your good to roll.

After you've cut off your flange from the sad excuse for a mid pipe, go ahead and cut off the flange that is on the cat end of your mid pipe as you will be welding on a 2'' extension and your flange from your stock pipe. Weld in your 2'' section and weld on the old flange from the stock pipe, you will have to make a small section of pipe to mate/flair to match up seamlessly to the STI mid-pipe other wise a little extra weld goes a long ways.

After that is done you can install that section as it will match up perfectly to your existing hanger locations. The comes time to modify the hangers on the muffer itself.
Depending on the year axle back section you recieved the modification could be different in a couple ways but the basic jist is the same, get out a big demolition bar or pry bar and apply some force to bend them down into place.

Use some exhaust paste, tighten bolts down snug, fire it up and let it sit and get hot to make the paste make its seal and call it a day!

My conclusion on the install of the STI catback vs. the STI axle back only? I dont have a comparison to go by but overall I'm having some fun with this machine!! Power is more available at all RPM ranges and I do mean all, not just mid/high but more so from 1k up to well where ever you decide. Me personally I dont like revving a horizontally opposed motor over 5k so that's my redline lol. But I'm getting great power, my motor just seems much happier overall. Shifts are much cleaner, smoother with less falling out of rpm's, downshifts are smoother. All in all I think this mod was great!! And I'm glad I went with the full cat back vs. just the rear section. Not sure what it will actually dyno as I dont have a base to test it against but I'd like to say that it's in the 5-10whp range as it is very noticable when acclerating.

The sound.....If your above 2k rpms you dont even realize you have changed a thing noise wise =(, I was hoping for a more aggressive tone but was only given a slightly deeper note when at the lower rpms. My girlfriend actually said "I'd didnt even notice a difference.....I was expecting more ??Vrrrooom VVVrrrooom!!" lol. Thats what our son said whenever we told him we were going for a ride in the Integra (He's only 8 months lol) but he would go vrrrooom vrrrooom so I picked on my girlfriend about it and now that's her referense to an exhaust lol. But enough about that, needless to say. If your going for more boxer rumble, cut out the factory resonator in the mid pipe as it's much larger than the one on the stock piece and see what happens. I'm still tempted to but will probably keep it the way it is until I get done dyno'ing it.

Nick.
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