I had a 96 4x4 blazer with a 2 chamber flow with 2.5in pipes and 3.5in tips... now i have a 2001 2wd blazer and i wanted to do the same thing but the guy that did my other wants 200 more dollars and said i can only use a 2.5 in tip
I am going to get a super 44 muffler but i don't know how to do the pipes
i just wanted it louder and i want to free up some MPGs

Any ideas?

 

You can weld on any size tip that will match up to the diameter of the exhaust pipe.

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Ihad myexhaust done for ~$200 total. I doubt that you are going to be able to measure any power difference and mpg will stay pretty close to the same. What you will get is a louder exhaust note.