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October 2023 by kevin west
Great Service and Excellent Attitude!Thanks Steven!
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November 2022 by Frosty
I bought a set of stage 2 heads for my mustang 4 out of 16 valve seats needed to be repaired because they were leaking the machine work itself was obviously done to fast with the exact same set up it made 9 horsepower and 4 foot pounds of torque more they were a absolute waist of time and money it would have been cheaper to buy a real set of quality headsheads
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November 2022 by William Wildowsky
I bought a set of stage 2 heads for my mustang 4 out of 16 valve seats needed to be repaired because they were leaking the machine work itself was obviously done to fast with the exact same set up it made 9 horsepower and 4 foot pounds of torque more they were a absolute waist of time and money it would have been cheaper to buy a real set of quality headsheads
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July 2022 by Nicholas Fandell
These Heads are BEAUTIFUL & POWERFULL! I got the XXTREME 255 LS heads and they are a work of art. Plus, the service and help from everyone I have spoken too is top notch! I truly couldn't be any happier than I am with Promaxx!! Thanks to Jason & Cole!
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November 2020 by Jason Jones
Great Quality and Great Customer Service
