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-   -   question about a down pipe mod (http://legacygt.com/forums/showthread.php?t=189483)

yannick 07-16-2012 01:36 PM

question about a down pipe mod
 
Hey guys how are you all doing...

I would like to purchace a turbo downpipe for my 05 legacy gt. Its automatic/automanual......

I noticed on the stock downpipes there are two(2) catalytic converters

The aftermarket down pipe im lookin to purchace is made for the automatic legacy but has only one cat from what I can see

Its the INVIDIA brand

which brings me to my question

(WOULD I THROW A CHECK ENGINE LIGHT IF I PERFORM THIS MOD?)
(GOING FROM 2 CATS WHICH IS THE STOCK PIPE, TO A 1 CAT AFTERMARKET PIPE)???

any help would be greatly appreciated

:)thank you:)

PeterJMC 07-17-2012 09:00 AM

Welcome!

You are correct, the stock downpipe (DP) has two catalytic converters. There is a third catalytic converter in the uppipe.

You may or may not throw a Check Engine Light (CEL) if you go from the stock setup to the Invidia or any other similar pipe. When I installed my Cobb DP w/high flow cat, I didn't throw a CEL.

05 LegacyGT 07-17-2012 09:52 AM

Welcome!

You will need to have the car tuned to run safely with the new downpipe, any check engine light that may be triggered by it can be disabled in the tune. There are a couple of different routes you can take for tuning. A cobb accessport with the stage 2 map is probably the easiest, but there are other ways to do it that may be better and cheaper if you know what you're doing. Check out the tuning forums, there's lots of great information in there.

It's also a good idea to replace the stock uppipe with a catless one if you are going stage 2. If you don't, you run the risk of the cat coming apart and destroying your turbo. Uppipes aren't very expensive and they require removing the downpipe to install, so it makes sense to do them both at the same time.

StoplightAssassin 07-17-2012 10:04 AM

replace the up pipe while you are at it.

a little more money, a little more work with the dp already off, and a lot more performance


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