took mine there to be set up
got it back slower than when it went and wasnt a happy chappy
took it to castle and they laughed about the settins put it right and it flew!!

my bro turbo ran for 4 years had no ploblems done loads and loads of shoot outs ,quaters,top speeds etc etc
took it there to be "live mapped" after a day on the "rollers"yea rollers not on the road!! they said there you go
first top speed run melted a piston!!

we rebuilt the engine took it to a top quality mapper
he found problems that should of been fixed before it was mapped the first
time,problems that meant that no way it could of been mapped propper

just my experince of jamsport