was yours laggy before for no other charge pipework?
if not I doubt it... its an eliminator which is your lag issue
 
No coober lag is formed because of the huge size of your turbine etc. The shear volume of air will moved will unlikely change by fitting smaller piping.
 
Yh im sure it wud i dont seem to get much lag with mine and iv got a ko3s and stage 2 remap.
 
Sorry m8 i aint got a link but under the bonnet all u see is the header tank and a bit of pipe work but from the front its stealth u dont see much just two more rads sit in front of ur main radiator i wouldnt say it weight alot.