ok ok ok, on the scion AND trd website they indicate that the TRD lowering springs for the TC give a 25mm, drop here is a conversion chart i found when i put in 25mm in: 0.9843" which is right under one inch
heres the website i got it from
http://www.convert-me.com/en/convert/length
type in 25 in the millimeter section and hit convert, it converts it to about 30 different units of measurement. so 1" IS the drop for the TRD springs on stock struts heres what i copied from the scion website:
Disclaimer
Base MSRP $16,200
Del, Proc & Handling $540
Accessories $199
Grand Total $16,939
Disclaimer
Estimated Monthly Payment
(Based on good credit and a 60-month contract) $329.45
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disclaimer
*Installation not included
Drop your tC an additional 25mm while improving your ride's overall stability and ground control with this kit from TRD. The springs are finished in pearl white.