The lower intercooler piping is possibly the biggest restriction in the intercooler system on the Evo. Just by installing the ETS Lower Intercooler Pipe you will gain 12hp in power and reduced lag time on initial spool up and improved transient response between gears. This piping can be installed by itself without a retune and allows you to upgrade the upper intercooler piping down the road.  Our piping kit fit perfectly with both the stock and ETS intercoolers.