I can tell you from experience - I have had nothing but excellent service from Whitehead Performance.
They have done all my bolt on installs and tune. They are getting ready to do a 4.08 gear, oil cooler and Qaife LSD.
I trust them. Sure you could probably find cheaper but for me it's about how you are treated, excellent work on the car and the people you deal with. YMMV.
Ed
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