when installing longtubes whats the process? what happens to the factory y pipe. does it bolt back up to the catback system, what are the pros and cons? because i dont want too buy a new catback system and not be able to use it any help would be great thanks

 

Stock y pipe can be trashed, Jack the car up put the headers in then you need a custom fabbed Y pipe to weld to the part where your I pipe straightens out.