I was doing a little research and I read that larger turboes ahve less back pressure than smaller turboes. I assumed that this was because there is less volume for the exhaust gases to escape in the smaller turbine housing than in the larger one. I also know that the smaller turboes spool up faster than the larger ones. Since we have an I4 in our car why cant we use a small compressor for quick spool up and a larger turbine housing for less backpressure and get the best of both the large and small turboes. Does this make sense? Thanks for the input