Ok, need some help deciding which catback to go with. I want something fairly mellow, definately on the quieter side of the catbacks, just something to give it a mean growl. Narrowed it down to cobb, greddy sp2 (don't like the way the evo2 looks), or maybe the SPT. What would you guys say sounds the best and is the quietest? If I'm not looking to do any crazy engine mods, is 3" catback overkill? Like am I going to loose any low end torque by switching to 3"? Thanks for your input!