i installed this today in my driveway with basic tools and a toaster over
measured pulleys
stock pulley circumference using my measuring tape was 63.34
srm pulley using same measuring tape was 57.93

Untitled by saxonbrian2, on Flickr

Untitled by saxonbrian2, on Flickr

Untitled by saxonbrian2, on Flickr

Untitled by saxonbrian2, on Flickr

Untitled by saxonbrian2, on Flickr

Untitled by saxonbrian2, on Flickr

Untitled by saxonbrian2, on Flickr
provided tool worked great and fitment was great
measurements others have taken that i found on the web
Stock = 63.25mm
APR = 57.75mm
GIAC/AWE = 57.15mm
srm = 57.93
for the price you cant beat it, unfortunately apr and giac require you buy their pulley (overpriced!)
i will be sending out my ecu for a flash by EPL within the next week or two and plan to update with dyno figures and logs to show the differences
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