Many on this board say that metal CAI tubes get hot. Some say that plastic tubing is the best way to go (besides that ugly ass stock rubber crap) ... but the majority feel that buying a K&N drop in replacement and removing the air silencer (as previously mentioned) is the best 'bang for your buck'. I am making my own out of stainless pipe and 45 degree silicone cuplers .... it's really a matter of personal preference. The only reason I am making mine is because the rubber thing looks horrible. And I might gain 1 hp.