I went "stage 3" hog-zawst today on my 2.5i with EUL headers... Holy shit I never thought that my car would sound this deep! it sounds similar (but quieter) to a 3 in TBE on a wrx/ sti without the whistle.
I'll post a video soon.
Edit: went down to stage 1 I think I'll go to stage 2 and stay there.