I've already got the intake. I had a guy try to sell me an exhaust yesterday too. I wish that I was made of money. I don't know why people keep trying to get me to change my car. The GSR is fast as it is. I don't need a thousand dollars worth of modifications to be able to smoke Nissans.
Even stock the GSR is a race even for an Si. I figure that keeping it stock is going to be ok for now. I like the intake because it is loud.
I wouldn't want a muffler drowning out the intake anyway.