I dont know how under drivers perform on other motors, but they are a nightmare on the old 5.0s. Almost always cause charging issues. I cant speak for the 4.6 or new 5.0 tho if you have either of those.
They're good...Cheapest definitely isn't always best but I've had my SR's for 5000mi now and they are just fine. Slight difference in the way it feels, 1.5-2mpg increase on highway. Solid mod if you ask me.
I heard steeda was the best to get under drive pulleys from
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