The biggest downside of this system is the thin steel. In Colorado it will last for years but anywhere else it will rust quickly. At first glance it looks like a perfect fit. However, the Legacy exhaust is about 5" longer and the downpipe (DP) cuts over to the middle too soon. Unfortunately, the DP had to be modified to fit next to the automatic transmission. I think a 5sp would not have this problem. I drew on the following picture to show the differences and where you will have to hammer for the transmission fit.
Larger Picture Link
These pictures were taken after I took the exhaust off to upgrade the turbo and add a catalytic converter back. I had to cut 1/2" off the top transmission mount tab and re-weld it. The bottom transmission mount tab had to be notched on top.
The O2 sensor is further back on the downpipe so I had to cut than lengthen the O2 leads. The above photos show the different location of the O2 bung. For the O2 wire extension I used small naked wire crimps from NAPA with heat-shrinks then wrapped by the black cable cover.
Note the missing turbo shield. I had to modify it and put it back on because the turbo was melting the wiring near it. Once we got the downpipe fit completed we moved to the cat-back fitting.
The major mod here was the right side muffler hanger. It was heated with a small torch and bent to the correct angle. I also used longer rubber hangers to make the four hanger points fit.
The above photo shows the WRX exhaust is missing. The fat round piece in the downpipe is a fake catalytic converter and I need a real one for Colorado emission testing. Basically, I cut out the fake one and put in a temporary straight pipe extension until I could order the correct catalytic size
After much research and measuring the stock catalytic converter I found a perfect fit at Eastern Catalytic. The 3", no air, 14"; overall length cat is for a Ford Ranger. The part number is 70330. I forgot to take a picture of it off the car but here it is installed.
As you can see I am a bad welder. Here is what the exhaust looks like under the car. I does hang a bit lower than the stock system. So some speed bumps are an issue with the muffler.
The results were better than expected. Like my son said, "It puts a smile on your face." This video was taken before the cat was installed.
YouTube Video
With the cat on it is a bit softer and some of the rasp is gone. Thanks to all the previous posts here about WRX exhaust installs, it made this install go well. I've also put this up on my blog 303Lurch if you want to see the larger pictures. Just click on the pictures to get a larger pic.
Its a 5 spd and the down pipe fit pretty well. Mine is temporarily installed as it came with a couple strategicly placed thick pieces bailing wire & and a 'massaged' muffler hanger. The mount on the back section of the DP to the tranny was a tight fit but it did fit. I can't weld so I'll have one of my welders do similar modifications to it sometime soon (working on other fun issues...) for a better fit.
.