I had the dc 4-1 on my 99 Gsr and it hit a lot of crap. I took it off and added a Kamikaze 4-1 ceramic coated header. I was a little skeptical at first, but suprisingly it is built pretty well and put down more power than the dc I had. The good thing about the kamikaze is that it is 4 into 1 down pipe, not 4 into a cluster into one outlet, it is 4 collecters and 1 down pipe that meets in the middle. It tucks right under the car and I bought my from ebay for about $250 you can check out his website. It is www.bigjoshracing.com