What is the best size of intercooler tubing?
In general, the best size is that which minimizes size changes throughout the system. Considering stock 2.3T’s have a 2″ outlet at the turbo and a 2.5″ inlet at the throttle body, using 2.5″ tubing only requires one size change; from 2″ to 2.5″ at the turbo outlet or intercooler inlet. If a 65-70mm throttle body is used, 3″ tubing from the intercooler to throttle body can be used, though it won’t offer a power increase over 2.5″ tubing unless you are making 600+hp.
