I held off in the early stages upgrading my SC pully. I believe there were two companies offering them. For those that have installed them I ask.. have they held up without problems and have they actually increased performance?

 

as far as i know only code 3 offers a s/c pulley upgrade. tvt machines oem pulleys for a combination of bigger crank pulley and s/c pulley but i dont believe they sell them separate.
as for reliability a few issues in the original production but havent heard of a failure to date. i have a c3 to be installed this weekend after dyno tests. there are definate increases in performance.
the debate has raged whether the c3 was equal to a 178 crank pulley, and the consensus seems to be that they are close to equal. as for a larger crank pulley ie: 181 185 192 these will all outperform but are more costly and tunes are highly reccommended

 

the only reliability issue that has come up tends to be the supercharger bearings go sometimes (but this can happen with any setup, but code 3 has a replacement bearings. typically most have posted that the code 3 gets slightly less boost than the ASP 178, but as 32krazy said far less than the 181 and 185.

 

Are there more than one company that offers machining of the OEM SC pulley?

 

i think tvt is the only co. offering this service. its in another thread and they say its not something they want to do on a regular basis due to the current workload they have.
i would recommend if you are going to size down your oem pulley research first HOW much you will want turned down. millimeters make a big diff. here as the s/c is spinning at a huge rpm.if im correct oem is 72mm c3 midsize is 69mm and c3 s/c pulley is 65mm. also a bearing swap should be considered as when i took my oem off at 40k i found sizeable bearing wear on the s/c pulley AND on the idler puller. also the tensioner pulley shows some wear and is being replaced just as a precaution