So it has been a few days since I installed the Mantis Underdrive pulley. I can tell a difference on the butt dyno. I feel the acceleration is a bit faster as well i will be dynoing hopefully this weekend to see the Power increase. I believe the average is 6-8HP to the wheels. Has anyone else done this mod (mantis pulley) and dynoed?

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Cayman GT
369BHP 325LBSTQ
313WHP 276WTRQ
some people like the regular stock factory look, cool people modify the car.

There have been 2 dyno charts posted for the very similar BBI pulley (Dyno Charts for BBI Under-Drive pulley, and BBI Autosport Underdrive Pulley Dyno), but nothing has been posted yet for the Mantis. The Mantis is 20% underdrive, and the BBI is 16%, so the Mantis might do a little better.

Can someone measure the distance around the mantis pulley?

I measured the stock Pulley at 18 inches around and the BBI at 15 inches around. Which is about 17% difference.

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DISCLAIMER: I'm not an engineer, I just play one on the internet.

BBI Under-Drive Pulley | BBI Roll-Bar
BBI Brake cooling package | GT3 Lower control arms
GT3 Front Sway bar | Tarett Rear Sway bar
Tarett Drop links Front & Rear | Tarett Rear Toe arms
Quaife TBD | Nitto NT-01s | PASM Springs

man sorry, I should have done that

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Cayman GT
369BHP 325LBSTQ
313WHP 276WTRQ
some people like the regular stock factory look, cool people modify the car.