I have the GTM stage 1 SC and recently ordered the Stage 1.5 upgrade.
Aprox. 475RWHP +-.
I have sent several emails and phone calls to Amin & Omar at Gamma.
They were very prompt to return emails and always answered the phone.
I ordered the kit about mid November, paid by CC and was just called by Omar to tell me the kit is shipping today.
Will update once I receive the upgrade kit.
I have had no issues with the stage 1 kit. Relatively easy to install and like the quality of the parts.
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