Ive noticed that my 4runner seems run loud. I am new to 4runners and wondering do they just normally run loud? Also i think my engine is missing some of the vacuum lines particularly near the rear of the engine. After browsing though some pics of the 5VZ-FE engines that some of the members have taken I have noticed that on the top of the engine near the rear there is a small piece of metal tubing that is about 12 inches long and it is held in place by a bracket. The pictures i have seen have had rubber tubing coming off both sides and connecting to other parts of the engine. The same part on mine doesn't have anything connected to either side. Can someone let me know what this is for and what it goes to? Thanks!