another thing to check is whether or not you use any chrome exhaust tip polish. i have a creme i use to polish my tips with and if you accidently get any on the inside of the tip, it will burn off - the creme is blue so you have blue exhaust for a few minutes! Andy Soma576@xxxx 1982 DeLorean DMC-12 VIN#11596 Fargo, ND 58102 [Non-text portions of this message have been removed]