I have a 2000 gsr and am looking to buy a full exhaust setup, e/c/h. I hear smsp makes great a great header for our cars and I was wondering how their 2.5" exhaust is? Also, how do I get in contact with them and how are their prices? Since I am most likely going to get the 2.5" setup for everything will it hurt my performance if I decide to not build my engine up in the future as I have decided to do now? All I have right now is the aem cai, can I expect to see respectable gains with this system with just my intake until I build up my engine some more? I realize that I would get better performance with a smaller diameter system at this point in time but the 2.5" should still help me out a lot right?