Hello, not really understanding the question as it reads. Are you asking if it gets hot can it mess the car up? If this is your question, yes, over time depending on how hot it gets, yes. Also, you have an oxygen sensor right behind the CAT. If it is getting really hot it can transfer to the O2 sensor and mess it up. Then you will be having O2 sensor problems too. Hope this helps.
Saturday, October 11th, 2008 AT 12:20 AM