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Not that I'm answering your question, but I put Borla Atak on my C6 GS years ago. The car was a non-NPP car to begin with. It had the over-the-axle pipes. Easy install, if you remember to loosen the center section in front of the axle-back kit. I was happy with the sound...no drone, nice pop on deceleration, and it didn't annoy my neighbors. I now have a 2019 GS, and the Atak was slightly louder than my 2019 GS when set to Track Mode in Engine Sound Mgmt.
Not that I'm answering your question, but I put Borla Atak on my C6 GS years ago. The car was a non-NPP car to begin with. It had the over-the-axle pipes. Easy install, if you remember to loosen the center section in front of the axle-back kit. I was happy with the sound...no drone, nice pop on deceleration, and it didn't annoy my neighbors. I now have a 2019 GS, and the Atak was slightly louder than my 2019 GS when set to Track Mode in Engine Sound Mgmt.
Greg
I have borla xpipe also, hopefully it will be louder than NPP.
Or i may go with BB bullets..
This is true. I noticed little diference if at all with Borla attack. It did change sound but not much loudness..
Agree. The ATAK sounds deeper/better and slightly louder compared to the stock NPP exhaust and stock xpipe.
For whatever reason the 60547 xpipe makes the difference between the two bigger (ATAK+xpipe is LOUDER than Stock+xpipe).
Going to keep the 60547/ATAK combo. It's perfect to hold me over until the long tubes come...
Side note: These tips are the black version of the intercooler tips (the 11869 tips, but black coated). That is one other option. Unfortunately, Borla does not do the rolled tips in black. That would be the ultimate for me, but I do like the intercooled.