quick question guys in order for me to put the 3.1 pulley on would i need to disconnect the pcm or can i just change it out and roll. currently have the 2.75pulley

 

Change it and roll.

 

No need to do anything other than put the pulley on.

 

10-4 thanx guys, here is the reason why im going back to the 3.1pulley. i have the 2.75 pulley on and was getting around 10.5psi of boost and with the 3.1 pulley is was around 7.5 to 8psi of boost. K now since i installed the meth kit and went to allens for a sd tune on it. with the 2.75 pulley after done tuning i was getting 12psi of boost. and timing was at 12*'s, at WOT it dropped to 10*s, IAT's were around 160*, at cruisin was around 129*s and my 43lb injectors were at 100% duty cycle. so by going to the 3.1 instead, should i see boost around 9 to 9.5psi and get more timing, and lower my iat's a bit more. cuz i think 12psi for a radix is alot of chet and dont think it would handle more. but we didnt even get Kr's at all at 12psi