I have 03 XR6T ute. I bought an exhuast today and im lookin to get my car flash tuned. 1. can I fit the exhuast without the tune or will it go into "limp" mode? <<<not sure on term 2. Which tune for my ute? im interested in being able to changed from time to time(8,10-14PSI) 3. will I need bigger injectors? Thanks for your help