So tomorrow I am going to delete the Resonator and Muffler off my s4 and run a straight pipe. Im just trying to get some feed back on what size pipe I should use. Anybody done this? Any suggestions?
Update: So I did a Resonator and Muffler delete originally but kept the stock piping and replace the missing peaces with 2.5 in piping. Ran that for a couple of week and just recently changed it again. This time cut it behind the cats and did a 2.5 true dual all the way back. Here a little clip revving it.
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