I had Apexi N1 and I'm using DD now. Here's my 2 cents:
Don't get N1 if ground clearance is an issue. My N1 scraped the ground everytime I hit a pothole or going in/ out of my own driveway.
DD offers the most ground clearnce on s13 (probably s14 as well), with silencers DD sounds just like my N1 (deep but not loud), without silencers it is VERY LOUD, kinda like a gutted motorcycle's exhaust.
My SR pulls harder in low-end & mid-range with DD.
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