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-   -   DIY: DownPipe Install (http://legacygt.com/forums/showthread.php?t=96587)

dmp 09-20-2008 12:21 PM

DIY: DownPipe Install
 
8 Attachment(s)
I initially balked at the idea for fear of rusty, scary bolts and nuts. But, thanks to a lift, and all tools I needed, the install went very well - 2 hours, even with me stopping to joke around and chat with friends there.

First I removed the heat shield. More bolts there (10mm) than on the turbo/downpipe itself. None were hard to reach. Along the passenger's side, there's one down there - a small wrench had it off easy. Feel around the casing and you'll be able to remove the heat shield from the top after you find the nuts (6 or 8 I think).

http://www.legacygt.com/forums/attac...1&d=1244731600
http://www.d-mphotos.com/images/spec.../downpipe1.jpg

Three 14mm bolts hold down the TIMC - there are two off the turbo, and one on the upper right of the IC. Channel-lock pliers help the hose come off the BOV, and a screw driver to release the hose clamp around the intake inlet elbow thing.

http://www.d-mphotos.com/images/spec.../downpipe2.jpghttp://www.legacygt.com/forums/attac...1&d=1244731600

Now that the IC is out of the way, you'll see two bolts/nuts there on top, with a bracket. Those are 14MM as well - loosen those, then find the nuts on either side. Reaching your hand around it's possible to remove all the bolts on the DP/Turbo from the top.


As an aside, sprayed them down the night before with PB Blaster. They were so easy to come off, I was shocked - just torqued nicely, no worries.

Now, get under the car. There are two brackets holding on the stock piece, on up near the trans, and another down on/near the cat. They are 14mm as well. Only the one near the cat will be re-used. While you are there use a 22 open end to loosen and remove the O2 sensor.

Where that pipe connects to the y-pipe, there are spring-nut things. On the nut side it's a 12MM, on the other side it's a 14. The way mine were angled I used a 14mm socket one and a 12mm wrench on the driver's side, and a 14mm wrench w/ a 12mm socket on the passenger's side.

When everything was off, I had a friend use a pry bar a bit to move the pipe off the bracket near the O2 sensor. Once that got bent a little the whole thing came down.

Compare - see what the WG opens into on the OEM? A metal plate. A wall.

http://www.d-mphotos.com/images/spec.../downpipe3.jpghttp://www.legacygt.com/forums/attac...1&d=1244731600

As a pre-caution against the Invidia WG flapper-tapping, I grinded down near the top of the divorcer, to help ensure clearance.

http://www.legacygt.com/forums/attac...1&d=1244731600
http://www.d-mphotos.com/images/spec.../downpipe4.jpg

The Happy Machine!

http://www.legacygt.com/forums/attac...1&d=1244731600
http://www.d-mphotos.com/images/spec.../downpipe5.jpg

Just as easy, the new one went back up!

http://www.legacygt.com/forums/attac...1&d=1244731600

You can see the bracket towards the bottom there - down near where the two pipes are touching (but not yet lined up). That's the bracket we pried a bit to get the OEM pipe to drop. Also - there's one bolt you'll have to get from under - and you'll have to use a wrench. The way the pipe works, there's no clearance for a socket.

http://www.d-mphotos.com/images/spec.../downpipe6.jpg

After everything was tightened up I took to grinding/trimming down the Heat shield. I WISH I had remembered to take a photo of it. I'll find a photo of a stock heatshield and mark where I cut it.

Now - everything is back together and I'm set! I get the whistling/chriping - makes me think there's an exhaust leak. But I'll work those out eventually. As far as sound? To me it sounds like a tractor now.

http://www.legacygt.com/forums/attac...1&d=1244731600

:)

CapnJack 09-22-2008 07:16 PM

Good write up!

I see you have the limited addition Spec B waste gate flapper. :lol:

dmp 09-22-2008 07:52 PM

:D Thanks (the wheel is also larger in that pic, too - but nobody notices :( )

:D

FASTONE 09-29-2008 01:10 PM

I have a question for you, can you drive a car with a dp and no tune to the tuners location, around 20 miles, i got a Cobb DP and waiting to get it installed

dmp 09-29-2008 01:19 PM

Sure thing. Just don't go crazy. If you're into OpenSource type tuning I suggest (WARNING: NO AFFILIATION other than BEING A CUSTOMER. Me suggesting folk GO to this site, and contact them in NOW WAY implicates me as a part of this BUSINESS) visiting www.camtuning.com.

:)

For the record - I STILL have a HORRIBLE exhaust leak at the junction tween the DP and the OEM exhaust. :( Going to give it one-more try before taking to a muffler shop.

:)

Regal05LGT 09-29-2008 04:26 PM

Quote:

Originally Posted by dmp (Post 2082009)
For the record - I STILL have a HORRIBLE exhaust leak at the junction tween the DP and the OEM exhaust. :( Going to give it one-more try before taking to a muffler shop.

:)

Did you use any type of sealer? If not, try the permatex ultra copper, held every joint in my exhaust w/o leaks

dmp 09-29-2008 05:50 PM

Gonna try that next; thanks Regal.

:beers:

GTkansan 09-29-2008 05:57 PM

Did you trim the lower section of the heatshield too? I couldnt figure a way to get it it trimmed and retain enough points to keep it from rattling, basically i didnt reinstall the lower section, which I think was a mistake and i may give it the ole college try.

dmp 09-29-2008 06:08 PM

I did trim it - I have 4 bolts in, IIRC. I'll take it out this weekend and get pics for ya, aight? So...check back. To date, no audible rattles. :)

BigBad 09-29-2008 07:40 PM

Nice writeup.

scoobydoobie 10-02-2008 12:49 PM

nice write up. Your car sounds like a tractor now? any other aftermarket pipes or just the DP?

rurouni_x 10-02-2008 01:58 PM

did you put the donut gasket back on to your DP-exhaust connection?

dmp 10-02-2008 02:28 PM

Thanks - Just the DP and an Exhaust leak where it meets the OEM Catback. :)

LOTS Of whistle, too - as I rev. REALLY like that sound; second only to a VTA EWG. :D

g2redgsr 10-11-2008 07:13 PM

heres my stupid question...what is the difference between the uppipe and dp? plz excuse my ignorance im new to turbos...

GTkansan 10-11-2008 08:02 PM

The UP goes form the exhaust manifold, and leads up and into the turbo. The downpipe (DP) comes out the backside of the turbo.


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