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They are two totaly different things.
The Apexi Dual N1 is a full cat back exhaust system. It goes from the cat to a resonator where it splits into two pipes goes thru the resonator back as two pipes into two seperate mufflers.
The megan is just a crappy slip on muffler were you have to make your own piping including your own resonator. you could go ricer and just hacksaw off your stock muffler and clamp this on but it would look and sound like shit. The mufflers are too small to do any good and the u joint to spilt the flow is horribly resrictive.
You are best off saving you cash for the N1 system. the only decent exhaust MR has is the 3" turbo cat back system. it's still loud and IMHO not as good as other brand name systems. I am very picky about my exhausts and have gone thru 3 already. Please don't get that POS muffler.
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Comments should be taken as Opinions not as Statements of Fact 
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