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I have heard good things about LMR. Personally, I have always used G-Force in Pearland. They do top notch work there and they will treat you right. Its a little bit further of a drive for you but it will def be worth your time.
LMR is a great shop, they are geared more toward "race cars" but they still do a good job, they build some serious machines to say the least.
personally, i have used LMR - would return if needed,
HPE- won't ever go back,
Fastlane- would return and they did a great job installing the pedders suspension on the wifes G8 GT,
and now am using PowerFab- great group of guys and relatively cheap for tunes.
while getting your tune, if you haven't done the skip shift, have it tuned out. you can also have your speed limiter bumped up or removed also.