not sure if its normal but it does look low to me. I had a borla on my lowered G35 and dented it badly when I drove a shredded tire. Borla did replace for free under 1,000,000 mile warranty. Im sure the Borla owners will chime in. we need another member to match this photo so we can compare directly
2010 LEXUS ISF / F Sport rear Sway Bar / Michelin PSS
The ISF......The perfect car for an enthusiast. It can be driven to the track, run hard all day , and then transport me hundreds of miles home in luxury and comfort to pick up the wife for dinner and a movie....
You have to make sure that the pipes from the mufflers align with the diffuser tips. After I installed mine I realized that the pipes from the left muffler were pointing slightly up (the back of the muffler hanged low and so did the pipe). I just unscrewed the bolt/clamp, pushed that pipe up and tighten the bolt/clamp again. After that, everything aligned perfectly and the pipe didn't hang that low.
You can even see it in your picture how the back of the left muffler is hanging lower than the right one.