when you get your Megan's, it might be a good time to do a thorough check of your exhaust system before installing them. Check the Ypipe, Midpipes for any parts that are rusted and possibly broken or loose. Check the exhaust gaskets at the connection points of the exhaust pipes as well as the exhaust - rubber hangers (those age and can get brittle and break).
You'll hear a better tone than stock during start up and cruise, while at WOT it'll be noticeable but not obtrusive. Just be careful, it might just entice you to keep adding more to the exhaust in terms of upgrading more exhaust parts if you want to go louder
have fun with modding and welcome to NICO!