I just had the Berk HFCs installed by a professional and it took them about 1 3/4 hrs. Before I took it in I put the car on ramps and tried to loosen some of the nuts. If you are wedged under the car is is tough to get good leverage on them. I tried going thru the engine compartment for the top two nuts (using a 1/2" wrench and extenders) and couldn't get them off. The exhaust pro ended up breaking them off. It was worth all the trouble though as they really sound nice.
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