Last resonator and exhaust delete with new tips or last resonator mufflers gone replace with N1's. What will sound better ? On a 3.5

Planning a muffler and last resonator delete for my 08 3.5 coupe. Should i just use reg tips. Or use these N1 tips/muffler I found. What does N1 mean anyways, online is very vague about them? Appreciate the help

Cool thanks, I'll post when it's done

about to tackle a muffler delete on an 08 3.5 coupe. Gonna chop it off before the last resonator and get a y. Any ideas for new tips. They gotta be big cause the stock ovals are 5" longways ??!!