Map tweak needed?
 

Hi all, im currently running full decat/ H&S up pipe with a vf34 turbo on my 06 hawk wrx and have figures of 330/330 at last remap, i find this a bit laggy compared with my old TD04 turbo tho, question is if i go down the route of ported headers and a Harvey trick up pipe or even a 2nd hand sti up pipe would it be wise to then have a map tweak?

yes, if the flow changes enough to change spool etc it will need a tweak

Cheers Tidgy thought as much