swapped mufflers got a ?

i went with a flowmaster super 44 and changed just the muffler left all the stock pipe with single outlet it sounds decent was wondering if it would sound better or even change the sound if i got them to put a Y pipe from the muffler and custom bent a dual exhaust any suggestoins? or do this im thinking about getting this exhaust tip looks pretty sweet http://www.assuredautomotiveproducts.com/Dual-Outlets-Angled-Slant-Cut-173-Long-AC1105.htm