monkonmonk Posted March 29, 2009 Share Posted March 29, 2009 ***DISCLAIMER***I know there are multiple posts on DP Installs, but I have never taken the time to do a write-up for all of my various car/Jeep projects. So, I thought the DP would be a great time to start. So, if you are reading this please bear with me as I take a stab at this write-up idea. Last night I installed my COBB DP and went Stg 2 with the COBB OTS Stg 2 93 octane map. I am using this OTS map before I decide to get a protune with the AP or go OS (Open Source). Anyway, here goes: First off, here is the engine bay where I started. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1370.jpg Then, I removed these screws from the main engine cover: http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1374.jpg Unscrewed, but not removed: http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1375.jpg This is what is looks like with the main engine cover removed: http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1376.jpg There total of 5 bolts and one hose clamp holding the TMIC in place. Here is the hose clamp hidden below all the hoses on the DR side. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1377.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1378.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1379.jpg Next, with the TMIC removed, it looks like this: http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1385.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1386.jpg There are a total of 8 bolts that mount the heat shield which are all easy to get to and 12mm. Here are some pictures of the heatshield removed. Pictures of it modified to come later. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1388.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1389.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1390.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1399.jpg The next step is to move the 5 fasteners for the actual downpipe connection. There are 3 nuts and 2 bolts with nuts, all at 14mm sizes. As said in other installs they can allbe reached from the top with various sockets and wrenches. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1392.jpg Next is the bolt that mounts to the transmission. In most aftermarket DPs this is not used again. It is also 14mm. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1393.jpg A view from the top: http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1394.jpg Further down the DP, there is a bolt and bracket just near the catalytic converter shown here: http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1397.jpg Additionally, there is the O2 sensor that also needs to be removed. This can be done with a 22mm open ended wrench, metric O2 socket, or adjustable wrench. Mine was torqued on quite tight and needed a little breaker bar. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1395.jpg Lastly, there are the two spring bolts that connect the DP to the Y-pipe, in my case the SPT cat back. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1398.jpg Link to comment Share on other sites More sharing options...
monkonmonk Posted March 29, 2009 Author Share Posted March 29, 2009 The downpipe is removed fine through the bottom of the car. I just had a jack used on one side near the passenger driver door jack point. Here is the stock and the used COBB DP side by side. Notice the flat plate for the stock DP at the wastegate location. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1400.jpg http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1401.jpg Here is what it looks like from the engine bay with the DP removed. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1402.jpg Here is the COBB DP in place with the top two bolts mounted to hold it in place. Notice my rubber glove to protect the turbo inlet from the TMIC. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1404.jpg Here is how I modified the stock heatshield to fit around the COBB DP. I wanted to keep the curve of the metal to bend around so that it was able to maintain some of its rigidity when I remounted it. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1406.jpg Here is what it looks like after it is cut. I used the combination of a hack saw and a dremel to smooth out the edges. http://i7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/IMG_1408.jpg Lastly, just follow the steps backwards to mount everything up. The hardest part I had was mounting the DP back into the bracket that was near the catalytic converter. Other than that, it took me about 3 hours including flashing the Stg 2 map and a test drive. Hopefully someone will find this helpful and Enjoy! Monk Link to comment Share on other sites More sharing options...
Deaks2 Posted March 29, 2009 Share Posted March 29, 2009 Excellent, I am sub'ing for future reference. Link to comment Share on other sites More sharing options...
suds2250 Posted March 29, 2009 Share Posted March 29, 2009 nice work and write up! 335HP/360Tq VF-22/1820 clone with Meth Link to comment Share on other sites More sharing options...
scoobydoobie Posted March 30, 2009 Share Posted March 30, 2009 Good writeup and helpful pictures. Thanks! Link to comment Share on other sites More sharing options...
Kupkake Posted March 30, 2009 Share Posted March 30, 2009 sound clips! Link to comment Share on other sites More sharing options...
EquinnoxX Posted March 30, 2009 Share Posted March 30, 2009 Love the step by step pix. I'll be tackling this soon and will def use this as a reference! Thanks! Link to comment Share on other sites More sharing options...
mikeislord Posted March 30, 2009 Share Posted March 30, 2009 Nice job. Link to comment Share on other sites More sharing options...
monkonmonk Posted March 30, 2009 Author Share Posted March 30, 2009 As requested...here is a sound clip. No driving for now. Just a cold start as this is when it idles the loudest. COBB DP Install :: COBBDPSPTCATBACK08LGTMT_0001.flv video by monkonmonk - Photobucket@@AMEPARAM@@http://vid7.photobucket.com/player.swf?file=http://vid7.photobucket.com/albums/y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/COBBDPSPTCATBACK08LGTMT_0001.flv@@AMEPARAM@@vid7@@AMEPARAM@@7@@AMEPARAM@@y256/monkonmonk/2008%20Legacy%20GT/COBB%20DP%20Install/COBBDPSPTCATBACK08LGTMT_0001 Link to comment Share on other sites More sharing options...
JoeFromPA Posted March 31, 2009 Share Posted March 31, 2009 Wow, seems alot more boxer rumble than the stock dp. That's an all-stock exhaust system, right? Joe Link to comment Share on other sites More sharing options...
monkonmonk Posted March 31, 2009 Author Share Posted March 31, 2009 Nope...COBB catted DP with the Subaru SPT cat-back. Link to comment Share on other sites More sharing options...
Bovesnh1 Posted April 1, 2009 Share Posted April 1, 2009 Thanks for the great writeup with pics! What does the Cobb/SPT sound like when cruising on the highway? Link to comment Share on other sites More sharing options...
GEE-OTTO Posted April 1, 2009 Share Posted April 1, 2009 +1 Nice write up only I could do it better ( if I had a LGT and not a 2.5i) and i commend you on that combo the sound is deep rumble really sounds nice man. how is the drone when driving ? can you talk in the car ? can ppl ride in the back and not get a headache ? Link to comment Share on other sites More sharing options...
sicklyscott Posted April 1, 2009 Share Posted April 1, 2009 I'd like to know about the sound as well, specifically before and after the DP as I already have the SPT exhaust. Link to comment Share on other sites More sharing options...
monkonmonk Posted April 1, 2009 Author Share Posted April 1, 2009 I have actually not driven the car since the test drive. I can try to take some vids in the next day or so of in car riding. Some full throttle and some with hwy cruising. For the test it was not that bad, but with the SPT only I had some complaints from some RR seat passengers. Conversations were never affected. If it is too bad, I am considering some sound deadening modifications because I like to be able to hear my exhaust, a.k.a. removing the SPT mufflers. Besides, I don't ride in the back. My wife has not yet ridden in the car, but that will be the ultimate test! Link to comment Share on other sites More sharing options...
Jerboa113 Posted April 1, 2009 Share Posted April 1, 2009 very nice writeup. Very helpful. I have heard about the process many times and seen SOME pics.. but nothing so complete as this. "The penalty good men pay for indifference to public affairs is to be ruled by evil men." - Plato Link to comment Share on other sites More sharing options...
monkonmonk Posted April 1, 2009 Author Share Posted April 1, 2009 Well, I have a lot more photos that I did not include. If there is something that someone did not see or a step I skipped, let me know and I will add it in. I don't want to think that anything is assumed. Link to comment Share on other sites More sharing options...
Jerboa113 Posted April 1, 2009 Share Posted April 1, 2009 perhaps this should be moved to how-tos and stickied? "The penalty good men pay for indifference to public affairs is to be ruled by evil men." - Plato Link to comment Share on other sites More sharing options...
apexjr Posted April 6, 2009 Share Posted April 6, 2009 I agree, this is a good pictorial writeup that should be preserved! Link to comment Share on other sites More sharing options...
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