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I went with the 38 lb spring. My car is not a full time track car & Frank suggested going with the 38 lb for that reason. He said it would be a little easier on the AC & alternator pulleys. He said a new Dayco tensioner was around 19 lbs compared to ARS tensioner at 38 or 50 lbs. I have not gone to the track with it yet. Bowling Green will open the first weekend of March. I will test it there with data logs.
good to know 50lbs it's too heavy for street/strip car