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Just got done replacing all my vacuum lines underhood with silicone hoses from; Boost Controller. Ted @ Boostcontroller sent me samples of both the 4mm (inside diameter) and 6mm to test and they fit great. The hoses has a 2.54 mm wall width, 100% silicone, and blue in color. I used cable ties to secure the hoses (they sell some although I used a quality 3M ties). Nice seeing all the vacuum lines in a contrasting color as they really pop out of the engine bay. Car runs very smooth and the hoses should last virtually forever. Bought enough to do both my 740 Turbo and my wifes 240. Quick ship, great customer service and they sell a nice variety of Manual Boost Controllers.
boostcontroller.com
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