Too much internal flow volume can affect turbo lag. Also longer piping is more likely to gain unwanted thermal energy. The shortest piping should always be from the intercooler to the throttle body. (Street Turbocharging by Mark Warner). The current piping on the car runs over the top of the engine and turbo, the piping will pick up heat from these sources. I'm not saying my lag is terrible, I would just like it to be a little better for auto cross. I rebuilt my 57trim ct26, It had a clipped turbine wheel on it which I did not like so I put an unclipped wheel and it made a significant low end difference. My car is a light weight 70 240z with 400hp, it's very fast, I just like to keep on improving anything that I can. I have a garage full of fabrication tools, I've been doing this stuff all my life and i'm simi retired, it's like a dream come true.