Okay, from your post, you're pretty much asking why the HKS will not fit the SE and GXE? Okay, I think I know what you're talking about. I believe when they did make the Stromung application, they did it on an GXE. The GXE application is the same application for the SE. Same places to hang the muffler, and same midpipe. I have no idea about the HKS, but if they have a B15 application, then I would suspect that it would bolt on just like stock. Not sure if I helped much at all to your questions.GXE2K said:I don't understand that, if the stromung bolt on is going to fit both SE and GXE, isn't that means the b15 has the same bolt on pattern? then why not the HKS cat-back?
which part of them are likely to be different?