Specs: 98 EK Hatch, d16z6, unknown size turbo runnin 7lbs...

I have 3" pipe runnin from the turbo all the way back to behind the passenger door and it just dumps out... It doesn't sound too great and its stupid loud... I've gone to a couple of exhaust shops and they told me I couldn't get 3" over the suspension for as low as my car is... So the two shops I've went to said I could run 2 1/2" from where the exhaust is cut off, over the suspension and back into a muffler... Would this screw up my flow and back pressure for my turbo?