Call Pauls High Performance they have a 10 second late model V6 Mustang - pretty bad ass i think they are online as www.paulshp.com as well
517-764-7661 - shop #
the JBA system is definately the way to go - they offer an "H" pipe system and a "Y" pipe system as well
Ive heard bad things about RPM as well throughout the communtiy and from reading various posts in chat forums
the new mustang already has descent piping up to the mufflers on these cars - take a look at the JBA axle back systems, JBA also has a set of shorties and even long tubs for these cars as well - might be worth looking at www.jbaheaders.com
JBA's are the way to go - they have different coated options and are smog legal for CA - give these guys a call they should have them in house
Brandt Racing 661-273-2273
My dad had the Kooks long tube headers on order for over 2 months for his GT500, he just canceled his order and ordered the ones offered from JBA - does anyone have any expirence with these on their GT500?
JBA makes a dual exhaust system for the V6 both a Y pipe and true dual H pipe system that comes off the down tubes from the headers ....they also offer a set of headers for your application as well
http://www.jbaheaders.com/05mustangnew.asp