Underdrive pulley recommendations?

[Jake Raby]

We see single digits here in the dead of winter, BUT the other cold weather data will be gathered by LN Engineering on their Boxster test car that I built the engine for in March of 09. They will certainly see temps well below zero.

In the heat of the summer this pulley did awesome both on the track and the street.

[Lobo1186]

now what is the threat here with the smaller pulley? the belt will move... slower and so affecting subsystems how?

[Johnny Danger]

I installed BBI Autosport's latest light weight UDP. I am very pleased with it. Its difficult to qualify any performance gain since it was installed along with some other upgrades. However, the car feels great, and there is plenty of data to suggest that it adds hp.

[Dragonwind]

Thanks for all the replies. I put my stock headers back in and likely my stock muffler this weekend. I never got dyno data but car feels exactly the same. I had the original maxspeed headers. Now it makes the muffler sound lousy so back to stock till I can find a decent PSE. I want the pully and likely Pedro's techno torque instead.

Chris

[jaykay]

I am running the Mantis pulley at the moment with no ill-effects save some power steering pump wine on full lock while parking.....It is suppose to give 7hp. I did notice a difference when I first put it on...the engine felt it was now free to give! The car pulled just a bit hard on full throttle...this is all subjective feel of course.