[Joshinator99]

Originally Posted by 2023_ZL1-AUTO

So, if I understood Mike correctly. By adding the CAM and having the head porting service done. This will make the intake air much process more efficient, thus, causing boost to drop a bit. Again, if I understood what Mike was explaining to me. Thus, we are adding the 9.60" lower to get the boost back in the range it is now, 21psi to 23psi. This is when I'm not getting belt slip, and have pulley wear or belt ware.

Making the engine more efficient at moving air means boost drops but power goes up. Your IATs typically fall too since the intercooler doesn’t have to work as hard…this is especially true on a less efficient blower like the OEM 1.7L blower. Your boost number is very high for the power level you’re at IMO. I’m at 19 pounds FWIW.