I have a Nismo S tuned exhaust for a g35 coupe with the Topspeed Extension pipe. I have the stock y pipe on the car and I would like to put the top speed y pipe on, how will this sound? I can't stand the way the G's sound with high flow cats and I don't want my car to sound anywhere near that.

 

Here is a video of a fuji exhaust (which makes the nismo) with a JIC y-pipe. I don't know how the topspeed y-pipe would sound, but this gives you an idea with an aftermarket one. It doesn't sound raspy.

 

Thanks a lot man this answers my question, and btw your right that exhaust doesn't sound raspy at all.