Question - I'm looking to get an exhaust upgrade, bolt on of course. Are the bolt ons truly 'bolt on', or is there more involved? I'm questioning if I should take the exhaust to a mechanic to put on, or do it myself. Assuming I have the tools and the time I should be able to jack the car, remove the old system, install the new system and drive away. Is ther any welding invovled, or other such nonsense?