I was thinking of adding a Hondata IM gasket (this should help being i live in a tropical country) and also while i am at it bore the stock CTR TB to 70mm.

I just got my car tuned 2 weeks ago. Will the mods cause much changes to a point where i need to re-tune my VAFC?

 

If you have a tune and you change something you need to tune it again to make up for the change. Most changes are beneifical once there tuned.

 

Would the changes be significant enough to require a re-tune?

Cash is a bit slow, so would it be ok if i drive around with the mods for some time before i go tune again?

Would increasing the size of TB affect a/f much?