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Old 03-31-2013, 02:26 PM   #1
TTUWS6
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Default Installing SPT exhaust on 2012 wrx

I just picked up a used spt catback that has about 8k miles on it. My car is a 2012 wrx hatch. I've been trying to figure out what I needed to install it. It came with the midpipe and muffler. Do I need any additional gaskets or bolts? I have a stock downpipe. Anyone know what size wrench(s) ill need? Also I was going to just buy a pair of jack stands. Any other advise is appreciated. Was also just considering having my dealer install it. Although I wasn't sure if they would install used parts.
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Old 03-31-2013, 02:38 PM   #2
RoadKillDMD
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You'll need a gasket for the mid pipe-muffler connection. You might be able to use the rest of the hardware from the stock catback (bolts, hangers, etc.). You need to get the rear in the air. Jack stands are perfect, but you could also use service ramps. IIRC, all you'll need is 14mm socket/ratchet and wrench. Maybe a 12mm too, can't exactly remember.
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Old 03-31-2013, 02:41 PM   #3
ouchx100
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Exhausts are easy. If the two pipes are connected together you shouldn't need anymore bolts. Just unbolt your old catback, then wiggle it out of the hangers (wd40 usually helps) and the reverse order to install it. Check youtube for install videos any cat back exhaust will be the same.

I've never done it on a 12 but thats what I did to install it on my 06 about 2 years ago. Its a really good quality exhaust enjoy it.
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Old 03-31-2013, 02:46 PM   #4
RM_2
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Quote:
Originally Posted by RM_2 on Indiana Impreza



1. The hardware kit and axleback (muffler) between the SPT exhausts for the '11+ WRX hatchback and the '08+ STi hatchback are exactly the same. The hardware kit contains two bolts, two nuts, and two washers for use with the midpipe to axleback. It also includes the donut gasket between the downpipe and midpipe and the gasket between the midpipe and the axleback.

2. The midpipes for the WRX and STi are actually different part numbers according to Subaru (just got back from TW Subaru) but the STi SPT midpipe STILL fits the WRX because that's what I did and it fits perfectly.

3. The gasket between the midpipe and the axleback for the hatchback SPT exhaust ('11+ WRX 5DR, '08 STi 5DR) is a crush gasket made of graphite and some metallic particles which upon uninstallation could just break into a couple of pieces. Not replacing the gasket was an "I didn't know!" moment that caused boominess and made the exhaust drone like my old Invidia N1 Race.

4. The appropriate gasket used for the task measures 3" inner diameter, ~3.5" outer diameter with a thickness of 3/8". Next time around, I'm totally making my own instead of getting the hardware kit.

The ultra blurry pic taken after I removed the old gasket, which I had to scrape off with a flathead screwdriver:


5. Cleaning tips for the SPT exhaust: Use Eagle One Nevr-Dull every once in a while to get carbon deposits off your shiny tips. It works wonders.

Copied and pasted from the guide I wrote up for Indiana Impreza. Might be useful


You'll need 12/14 mm on the nuts and bolts between downpipe and midpipe and 17mm for the nuts and bolts between midpipe and axleback (muffler). I did the install with ramps but I've also done exhaust installs with jackstands. It's easy enough to do if you're small enough of a person to fit under the downpipe to midpipe area. You'll want someone else to help, especially for the uninstallation of the stock catback. I had help and the midpipe still smacked me in the face.

Last edited by RM_2; 03-31-2013 at 02:51 PM.
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Old 03-31-2013, 04:59 PM   #5
alx8283
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If you don't have help, tie wire, zip ties, rope and/or ratchet straps are great replacements for a second set of hands. The items listed above can be used to "catch" and hold portions of your exhaust (or anything too awkward for one person) once they are no longer mechanically fastened. This way one part isn't dangling around putting more stress on other parts. It also allows you to methodically lower each portion so that you don't have to wrestle it.
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Old 03-31-2013, 06:34 PM   #6
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I bought a set of ramps and was checking out the stock exhaust and it looks pretty straight forward. My only question that remains is about the gaskets. So I have my spt axelback bolted up to the midpipe even before I began to take the stock exhaust off. Is there supposed to be a gasket between the spt axelback and midpipe? Or am I supposed to use the stock gasket once I get it off and put it between the spt? I assume the donut gasket is the one that connects the downpipe to the midpipe and I can just use the stock one to connect the spt exhaust? I'm afraid to take my stock exhaust off without having a backup gasket incase the stock one falls apart. Where do I get the gasket? Sorry for the long message just want to make sure I'm doing this correctly.
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Old 03-31-2013, 07:12 PM   #7
RoadKillDMD
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Quote:
Originally Posted by RoadKillDMD View Post
You'll need a gasket for the mid pipe-muffler connection....
You can get one from any Subaru dealership, online, or make one out of gasket material from AutoZone.
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Old 03-31-2013, 08:18 PM   #8
chino_487
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this is the part # for the donut gasket:

44022AA123

good luck.
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Old 03-31-2013, 08:31 PM   #9
RM_2
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Quote:
Originally Posted by TTUWS6 View Post
I bought a set of ramps and was checking out the stock exhaust and it looks pretty straight forward. My only question that remains is about the gaskets. So I have my spt axelback bolted up to the midpipe even before I began to take the stock exhaust off. Is there supposed to be a gasket between the spt axelback and midpipe? Or am I supposed to use the stock gasket once I get it off and put it between the spt? I assume the donut gasket is the one that connects the downpipe to the midpipe and I can just use the stock one to connect the spt exhaust? I'm afraid to take my stock exhaust off without having a backup gasket incase the stock one falls apart. Where do I get the gasket? Sorry for the long message just want to make sure I'm doing this correctly.
The stock catback's midpipe to axleback gasket is NOT compatible with the SPT exhaust. You can, however reuse the downpipe to midpipe donut gasket. I just installed my SPT exhaust last week. You'll need the gasket that I pictured in a previous post. The only way to get the gasket is by ordering the hardware kit for the SPT exhaust. No, you cannot get one standalone from the dealership. I tried that this week and ended up having to special order an entire hardware kit. My recommendation is to make your own if you already have the nuts and bolts. See the following for info:

Quote:
3. The gasket between the midpipe and the axleback for the hatchback SPT exhaust ('11+ WRX 5DR, '08 STi 5DR) is a crush gasket made of graphite and some metallic particles which upon uninstallation could just break into a couple of pieces. Not replacing the gasket was an "I didn't know!" moment that caused boominess and made the exhaust drone like my old Invidia N1 Race.

4. The appropriate gasket used for the task measures 3" inner diameter, ~3.5" outer diameter with a thickness of 3/8". Next time around, I'm totally making my own instead of getting the hardware kit.
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Old 03-31-2013, 10:29 PM   #10
xluben
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I think you have all the info you need, but you really don't need two people. I've swapped my exhaust about 12+ times and had it off for other reasons at least half a dozen more. I have never used two people. Just make sure your face isn't in the way, and put down cardboard if you're worried about it bumping on the ground (although it really doesn't matter).
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Old 06-27-2013, 10:42 AM   #11
oharao2
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What a PITA! The subaru dealer wont sell the 3" crush gasket btw the mid and the muffler seperately. They want me to buy the $42 hardware kit. So onto creating the gasket myself.

Anyone have a recommeded gasket kit? I see Advanced Auto has 4 different Mr Gasket Kits on their site. Which knowing advanced they are crap. I also have a local small auto parts shop down the street i may see what they carry.
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Old 06-27-2013, 10:47 AM   #12
Somerset Subaru
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Which gaskets do you need. They might not want to sell them but I certainly will


-Adam
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Old 06-27-2013, 10:56 AM   #13
oharao2
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Quote:
Originally Posted by Somerset Subaru View Post
Which gaskets do you need. They might not want to sell them but I certainly will


-Adam
Its the 3" crush gasket seen above in post #4 and i would love to give you business but i'm hoping to get this installed this weekend. I may try calling Bert Smith since Mastro didnt want to work with me. This cant be the only way they receive the gasket.
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Old 06-27-2013, 03:16 PM   #14
oharao2
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Here is the direction i am going to try: a product called Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker that comes in a tube. Im pretty sure this should do the trick. I figure put some in the joint slightly tighten the screws for the first day and then fully tighten them the next. Should seal right up. Its good for up to 700degrees which on the mid to muffler can connection should be more than enough.
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Old 02-02-2016, 12:37 AM   #15
the_snowman
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Default SPT Exhaust Hardware Kit D441SFG010

28 bucks online. Add 6 for shipping.

To my door for 34 bucks. Local Dealer wanted 42 plus tax.

SCORE!!

Will measure Midpipe to Axleback gasket and look in Walker/Felpro/etc catalog to see if there's an eqiv for next time.

Donut gasket between downpipe and midpipe is 44022AA123.
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Old 12-04-2016, 06:24 PM   #16
unseen
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Quote:
Originally Posted by the_snowman View Post
28 bucks online. Add 6 for shipping.

To my door for 34 bucks. Local Dealer wanted 42 plus tax.

SCORE!!

Will measure Midpipe to Axleback gasket and look in Walker/Felpro/etc catalog to see if there's an eqiv for next time.

Donut gasket between downpipe and midpipe is 44022AA123.
so what is the part number for the mid to axleback gaskets we need for the spt. i just picked mine up and want gaskets before i decide to mess with permatex or other.
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