the v6 will work with mods but ur gona need a serious bank account.
head work is a good starter 10%power around 1k
exhaust manifolds will be a great route as they flow like cr4p 1k ish.
a chip... dont expect a miracle £3-600
cams good for 20bhp £500
s/s zorst 5-6bhp £400
panel filter 3-4bhp £30
bottle of noz....50bhp to be reliable £5-600 (dry systems work well so i have been told)
s/charger 50oddbhp + good torque results low end. 4k ish
bottom end lighten and balance ?????? worth doing for all the above. price????????
8 grand ish should get u seeing good 0-60's and a national debt in fuel