Are they any downside's to running this turbo muffler with a 3 in. inlet on my all motor prelude?? I currently have a 2.5 in piping with a test pipe. What should I do???

 

i thought about it on mine, i know people running 3 in exhaust on k series, so if you have a hardcore all motor set up then i wouldnt think so

 

Nothing if you have 2.5" piping from the header back.

If you stepped up to 3" piping from the header back, you will probably change the car's power band a bit, lose a bit on the low end, gain on the high end.

2.5" is good for NA though.