Sorry if this is the wrong place to ask, but I'm wondering if anyone can recommend a good performance shop in the Denver area?

I've got a 2002 Z28 A4, and I'm looking to have my 2.73 gears changed to 3.42 or 3.73. The dealer wants $2,500 for this, and I think they're on crack

I don't even know where to start to find a good, reputable shop to do something like this, so if anyone has any suggestions I'd really appreciate it.

Thanks!

 

Any decent auto shop can swap out gears. Just ask around.