| I bought my set used, the previous owner had an auto tranny that could not hold the extra power. Here is a short write up on them- [ http://twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=1348707 ] I can not speak to any customer support issues with GMS, as my set was a couple of months used from a tt.net member. I would not expect any support on the GMS 550's, I think Chip would probably answer my questions if I had any though. I have emailed chip in the past on other Z related issues and he has always emailed me back. I think I have purchased from him as well, I can't remember the item however.

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