I tried the homemade fouler combo( 1 drilled , 1 not) as well as the Vibrant O2 extender where u can swap out the diameter of interchangeable parts to change exhaust flow, + a 90* adapter- nothing worked for me. I was very tempted to try the "MINI CAT" but I heard those have worked for some but have a 200-400 mile break in period. How far r u from me, u want the vibrant parts? I am very interested if u can find a mechanical solution to the CEL.