Yes, I picked up 3 full tenths over the other head (stock piece) but was later in the season (summer run then fall run i.e. better air maybe) so not sure of exact gain. One other note, running on slicks in the summer and switched to my drag radials in the fall... that too could make hurt times alittle, but I would have to say it was worth 2 tenths min. Hope this helps. doesnt seem like too may guys out there playing with these cars, so feel free to ask anything else
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