I figure if you have 2 tunes in the car doesn’t it go twice as fast?
These things look identical! Only difference i really see is the backside where the pulley attaches, APR is more rounded, GIAC is more square. The front side looks identical.
http://oi57.tinypic.com/2lv0pj8.jpg
They do all look the same, the SRM pulley grooves are not tapered, whereas both the APR and AWE pulleys are, the APR pulley is the only one that has the extra material on the inside, tapering outward.
I personally purchased the SRM as well as the AWE, and a friend stopped by with his APR before install, so I have caliper pics of them all
My lord, I just fell off my chair laughing roflololol!,