i currently have a borla cat back system on my g, but i am interested in getting the borla headers as well, but i am concerned that it might be a lot louder. does anyone here have the two together? and is it loud?

 

I have both along with an Injen CAI. The sound loudness is not too much louder but the sound is changed a bit. However, you might want to hear both of them together before you purchase it. Aside from sound, David Borla told me the gains were dyno'd to add 8HP on my coupe with Injen CAI and Borla true-dual exhaust. All in all, it sounds very nice together and "feels" (also dyno-proven) as though power is gained, so I would recommend it. I don't know if these are the best headers/exhaust on the market but I do know they are one of the best bang for the buck combos you can get. Hope this helps....