Hey guys and or girls,
I'm looking to do a turbo setup in the near future (a FB stage 2) and it comes with a 3" downpipe. I have a 70mm exhaust system. I was wondering if this would cause pressure and if so is this a good or bad thing in a turbo setup. Any guidance is helpful. Thanks!

 

That's almost 3" exhaust. Nope won't cause much backpressure at all, no more than the turbine will.