ZZP
3800Performance
WBODY

I don't know of others. Those 3 are about the same price. Any others better for mail order tunes?

The process I am going to do is get a mail order tune from someone that knows the GTP (4-2 and 3-1 shifts, 40mph lag, etc) Then I am going to get a dyno tune off of that from my local shop to make sure the air/fuel is perfect.

Thanks in advance,

Tim