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Old 10-03-2005, 11:00 PM   #1
gc835
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Default wrx dp fit a 94 legacy?

will a dp off a 03 wrx fit?
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Old 10-03-2005, 11:27 PM   #2
Natoe
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i have the legacy turbo motor in my impreza and got a wrx DP, and sti catback, and it works.
BUT if you plan on hookin it up to the stock exhaust the wrx one is like 1 to 2 inches longer then the legacy one. (i had both and compared them and i couldnt use the legacy one because it didnt reach)
and sti/wrx catbacks dont fit the legacy without modification.
hope that helps
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Old 10-03-2005, 11:29 PM   #3
gc835
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so a wrx dp wont hook up to a legacy exhust?
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Old 10-03-2005, 11:38 PM   #4
Natoe
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its a couple inches longer, it bolts up, fits down like it should then just sticks too far... you might be able to make it work, the bolt pattern on the flange at the bottom is the same even, just have to get rid of a couple inches or have it stick out the back too far (maybe)
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Old 10-03-2005, 11:44 PM   #5
gc835
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ahhh couldnt you cut the exhaust and take the extra off and weld the flange back on??
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Old 10-04-2005, 01:24 AM   #6
THAWA
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That's what he just said.

Why do you want one though, it's essentially the same thing.
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Old 10-04-2005, 02:11 AM   #7
gc835
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same as what? a 3 " dp???
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Old 10-04-2005, 02:19 AM   #8
THAWA
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What 03 WRX comes with a 3" downpipe?
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Old 10-04-2005, 02:22 AM   #9
gc835
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an aftermarket one made for a wrx
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Old 10-04-2005, 11:40 AM   #10
Natoe
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idont think its worth the effort unless you get a custom 3" catback too.... if you do that then ya, go ahead with the downpipe
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Old 10-04-2005, 09:01 PM   #11
gc835
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why not just use an after market wrx dp and an oem wrx catback. would this work?
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Old 10-06-2005, 04:46 PM   #12
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OK, seems that you are missing the point. STOCK, the legacy exhaust is several inches longer that the WRX one. If you go with the WRX downpipe, you will have to modify the rest of the Legacy exhaust to match up. My suggestion: put the downpipe on, and then have the rest of the exhaust custom made to match the 3 inch downpipe. That way you have a full 3 inch exhaust that fits your car.
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Old 10-06-2005, 05:02 PM   #13
Matt Monson
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http://bbs.legacycentral.org/viewtop...ighlight=turbo

Here, this should make it easy for you. That's a write up of my installation of a PDM divorced wastegate downpipe on my '94 Legacy touring wagon...
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Old 10-29-2005, 02:33 PM   #14
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Quote:
Originally Posted by gc835
why not just use an after market wrx dp and an oem wrx catback. would this work?
Yep,..........Can't argue with that one...HA!

Think of it like pouring water into a bucket with a REALLY big funnel, No matter HOW BIG the Funnel is, it is only as efficient as the smallest restriction in it?!?! (Weakest link in the chain and all that..........)

YES, it will get you some spiked/peaked figures low in rpm due to back pressure, (just like an N/A Eng works on B/P, so too does a S or T/Charged car befor eit starts to create it's own boost/inertia/momentum), but once the pressure equalises, there is a HUGE restriction at the "Cat".
Cheers,

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Old 10-29-2005, 10:11 PM   #15
THAWA
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Quote:
Originally Posted by sixpack subaru
just like an N/A Eng works on B/P, so too does a S or T/Charged car befor eit starts to create it's own boost/inertia/momentum

Sixpack Subaru
Backpressure is the enemy of ANY engine, it is never good to have.
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Old 10-30-2005, 12:22 AM   #16
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Quote:
Originally Posted by THAWA
Backpressure is the enemy of ANY engine, it is never good to have.

Try again.
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Old 10-30-2005, 12:34 AM   #17
THAWA
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Try what again? Backpressure IS bad, exhaust velocity is good. In the real world in order to have a good amount of exhaust velocity there is a certain amount of backpressure that develops. That doesn't make backpressure good. If I'm wrong, you're more than welcome to correct me, or at least explain why backpressure is good.

Last edited by THAWA; 10-30-2005 at 12:46 AM.
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