as in the title im looking to get more power out my 4x4 cossie without gettin more lag from it spec as it is:

t34 with 63 housing
dark greens
s/s exhaust
standard 4x4 intercooler
4x4 exhaust
baileys breather kit

the car is surprisingly quick and beats cossies running geys and all your scoobs n evos etc but i just want more power without getting more lag if its possible lol thinking of 55 siemens and a chip but think am gonna need to fit a rs500 intercooler wich i know will give me lag

had the car running a 2wd exhaust manifold when i fitted the t34 but it drove shit and the lag was real bad so went back to the 4x4 and its nite and day

any suggestions are welcome if you know what i am trying to achieve