Originally Posted by tighed1
Hi and WELCOME to the forum!
First off let me answer for Evan (Cruzinquick) before he gets a chance to. "The 178 pulley IS the fastest pulley ever! No one can beat me and my 178 pulley!"
LOL! 
I believe there is some truth to his answer of the smaller pulley being "faster" than the bigger pulley. Reason? Bigger pulley, more boost but not necessarily more power because of the extra heat produced from compressing the air intake.
I think that for street use you get more out of the bigger pulleys because your boost comes on sooner (lower RPM) where you spend a lot of your around town type driving. However with the bigger pulleys you are spinning everything else faster and bearing life could become an issue.
Personally I'd go with the bigger pulley and take 70GT6's recommendation and run the pulley saver kit just for added protection.
Either way you go you've still got one hell of a car!!
Enjoy!
While this is true you have three letters that make all the difference. C32 and not a SRT6. Weight and cold air intake limits are the two major disadvantages the C32 has. So not apples to apples sorry. Regardless whatever pulley you choose, get a datalogger and closely monitor your AFR's. Talk to Jturkel either on here or MBworld.org and get good info straight from the man who has tried it all. Always comes down to money and it's not how much you want to save. Do it right the first time. Good luck.