Well im rocking the S300 and i know i need a retune when i get the new equal length manifold. When i retune do i need to mess with timing or just A/F or both? i have a wideband and was just planing on street tuning the A/F and leaving the timing alone.

 

You will want to retune both b/c of the different characteristics between the inlinepro an equal length ramhorn.

 

Yup, it needs a retune... A different manifold will greatly alter the VE of the motor.

 

thats what I was thinking...

 

Ve?

 

Volumetric Efficiency ... wiki it !!

 

Basic terms, it will affect your engine's HP and TQ at a given PSI. So now your 10 PSI tables for example, will not work anymore because this same 10 PSI is now a higher HP and TQ.