http://www.bestmufflers.com/bshop/product_info.php?products_id=5713&osCsid=ef6cfe286e9397e021c35dfb14c823a1
These are bolt on mufflers, i got a Subaru Liberty N/A 4cyl 2004 gen 4
would i need uneven headers for the boxer rumble and will these mufflers be fine for more sound.