Ok if I go with a 17% do I need to change the belt, if I decide to go with a 19% I know I will have to change the belt but will I have to change the injectors?

 

You should change the belt with the 17% (I'd suggest it with any pulley change since youre right there), and with the 19% it's usually suggested to change the injectors.

Also, most of this has been posted many, many times. The search feature here is really good

 

Yes, you need a smaller belt.

 

Thanks for the search advice but I have many times, there are mixed opinions with the 19% needing injectors and the 17 needing a belt so I figued I would ask straight out!

 

Ken I just installed a 19% on my 06 MCS. It runs right out of the box. It deos not strave or acts as if needs more fuel. Installed the 19% first. Then drive it and see. My car runs hard. with just CAI and a 19%. No software mods no nothing. I am very happy!







Guido