Currently looking at both the OBX cat back and the top speed axle back with mufflers, I plan to pair the exhaust with test pipes depending on which one I go with. which would be the best to go with? and sound the best with test pipes.... thanks

 

I have an OBX y pipe with a Topspeed axle back. Without test pipes it sounds absolutely perfect. With test pipes, it gets louder which I don't mind, but also introduces some rasp and drone on the freeway.. I'm thinking of getting a resonated Y pipe because of this.