I want to put dual exhaust of my 90' Firebird, V-6, I want to use the 40 series flowmaster, can I?

Most use the 80 series Flowmaster, but i was wondering if i could use the 40 series, better performance, and louder.|||on a 6 the 40 series is gonna sound preaty damn ricey... flow masters honestly, are not that great of a flowing muffler. do some searching for flowmaster flow numbers compared to every one else. dynomax and SLP flow better.|||check with www.shopmufflers.com|||well i have a 97 firebird with the 80's series. I make a nice sound to it and made at least a 5-8 extra hp's.