Just curious if there are any test pipes on the market available for an 07 G35 Sedan. Are they the same as the G35 coupes or Z's? If so what would be the recommended test pipe to purchase. Also is there any sizable gains?

 

The gain was very noticable on my 03.5, but your '07 has a vastly superior exhaust system from the factory. I would doubt that you would see much gain and it would certainly cause you to throw a CEL and possible rasp too. I had to do quite a bit to make mine livable, but the gain was there so I went through the trouble to keep them on. Unless you plan to FI the car in the future, I would pass and spend the money on a spring kit or something.