I have a 2008 Mercedes cl550 5.5 liter engine! It gets about 11-12.5 mpg per gallon! When I installed this chip, I immediately saw improvements! Now I'm getting 16.5-19 mpg, not sure on HP because my non-chip Benz was fast, but I notice a quicker start! I would recommend BMW and Mercedes owners to get one of these chips! Many of my friends have already bought! I'm glad I bought one!
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