hey fellows after much much off and on and off and on. I sent my jb box back to t-bros to be tested sold new o2 mod went back to stock set up and ran the exact same. no codes talked w/dealer in new york said have same issue w/many spyders put tips in create back pressure= richer mix on low end. VERDICT worked BUT BUT sounds like grandmas little car now lol. so took off tips cut in half sounded bit better but still raspe. so took one out and sounds throaty again but little hesitation so i have come to conclusion either put power commander on so can be adjusted every 250rpm intervals or deal with it. what would you do? I have heard from many quad pros that any ecm mods usally doesnt last in long run only trick ecm for so long then they have problems:dontknow: BUT with all that said through all my ups and downs I still LOVE THAT DAMN SPYDER:2thumbs::2thumbs: