I am selling Helix exhaust off of a 2004 STI. Has About 3500 miles on it. 1 little scratch underneath muffler. I live in Brentwood (near Antioch). Down pipe is 4 in that goes into 3 inch all the way out. No cats just one resonator and muffler. I loved this exhaust and had no problems with it. I just sold my car and have nothing to put it on. E-mail me for pics that i will probably have tomorrow. Pat69187@hotmail.com Asking 650.00.Make me an offer. Also i do work in San jose if you are near that area also. ! more thing i do have the stock STI springs for sale. Make and offer on thase as well.