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i have searched and could not find out the answer to my question. I have an Apexi catback on right now and im buying a dc 4-1 header for real cheap from a friend, but its just the upper section. So i was wonder if the DC header will hook up to the megan test pipe that takes place of the whole cat piping?

 
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It probably should. I didn't even know megan had a test pipe out for the EX.

With all of that strait pipe, I would throw a resonator in there somewhere to cut down on raspy-nastyness.

 
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The megan test pipe should bolt up to the DC if the DC is the same size as the Megan 4-1. Megan's test pipe has been out a few years for the EM2.

 
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thanks alot another question though...whats the best way to go at tricking the o2 sensor that plugs into the cat?

 
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Spark plug non fouler IMO.

 
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2 of these

like this

 
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mine doesn't have anything.... EX header, megan downpipe, no defouler. it doesn't throw a CEL. probably cuz it only has 60k on it.

 
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well heres the deal, one of my friends crashed his em2 so i got his dc prototype header off him (4-1) and a magnaflow high flow cat. whats the difference between prototype and a regular dc header

 
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as long as i put those foulers after the high flow cat i shouldnt throw any codes rite??

 
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if you install the high flow cat you dont need defoulers at all. because you still have a cat.

when you get ride of the cat with a test pipe then you need defoulers or your gonna have a CEL

 
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True but many companies market "high flow cats" but are really test pipes.

 
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ya mine is like honeycomb inside, you can see right through it but theres no hole for the o2 sensor so i have to put in one of those after the high flow...and another question when i drill the hole for the fouler does it have to be at the same angle?