I just bought an 04 rs2.5 that I am attempting to sort through the bugs and apparently the so called mechanics work that the previous owner spoke of. I have a tsudo header back on my 04 2.5 and the flange doesn’t match to the stock headers. Upon doing more research I figure out that the po installed a 3 inch system which I imagine is giving me poor back pressure and am currently having misfire on 1&3 after replacing coil and plugs with no effect. I’m sure the 1/4 inch gap from header to cat doesn’t help but that’s what I’m currently attempting to fix. I’ve got the obx el headers in the mail and am looking to replace that tsudo with something a little less obnoxious while I’m at it. I’d like to do the stromung mid pipe and muffler (Undecided single or dual tip) but I am unsure of fitment between the obx and stromung. This is the first system I have ever put together and installed a system so pardon if I’ve made a mistake. Any help would be appreciated.