i know what an intercooler is used for, i sent him a message asking the reason, he was half way through a turbo conversion had all the parts ready to go just had to make the exhaust manifold and intake piping, im guessing he first installed the intercooler, the reason he stopped is he bought an s13 and is building that (reason he is also selling the ae86), and i know building it is a good process, but finding a nice stock one these days is a needle in a haystack even imports but your more likely to get a good condition, but yet yet finding one that has the body work done and the engine mods half way there i just feel if i miss the opportunity ill regret it when im struggling to find one.