down pipe

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2003 Spicy Orange MSP
I am having a custom down pipe and test pipe made in two weeks. i am trying to get some feedback i think im gonna go with 3inch down pipe and test pipe i have also heard a few people say i should go 2 1/2inch need some feedback. Also they said i may need a 02 simulator has any one tried this yet.. let me know
 
If you don't mind the noise, go with the 3" downpipe. I think your turbo sould spool up a bit earlier and faster due to less back pressure. Take out one of the cats as well, might we well remove the resonantor too!
 
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