i have 90 DA with a GSR T3/T4 with basic bolt on additions with Hondata s200 with dyno tune. i have a somewhat steady 11.6-12.2:1 air/fuel ratio through entire rpm range at WOT.(it stays around 11.6:1 but lumps up to 12.2:1 at 5k rpm then back to 11.6:1)----------- i had a horrible ebay crappy XS power manifold that cracked instantly at 10psi on the dyno. i have now changed to an awesome SLS ram manifold that fit great and everything but im worried about my air fuel ratio now, i know i need to get retuned to do it right but new babies at home make me broke.

the question is how far and bad will this change my air fuel ratio, i heard it would be bad, and spool up time is effected, but im looking for more input and experience from anyone that retuned after changing manifolds, is that A/F change catastrophic????
thanks in advance