Ralliart extractors & aftermarket exhaust

hey im looking for some power figures, ive got a set of ralliart extractors from that im going to get a set of tune lengh header pipes down to the stock cat through to a 2.5" system then down to a satinless steel 4"muffler also im getting the good old k&n pod filtrer. im not looking for exact numbers but a rough estimate would b sweet. im thinking about 15 - 20 kws (fingers crossed) thanx 4 ure help

on a RA lancer?? or is this and EVO

haha sorry.... i wish it is an evo but no its a 1998 magna tf 5spd. i live in australia evos are not common at all even more so than gtr's

estimate in HP your looking to gain about 20 to the wheels give or take

ha horsepower aye lol...not to familiar its roughly 14 kilowatts...not to bad thanx n e way
 
and what do you think about getting an apexi SAFC and getting it professionally tuned (dyno and such) would it to much to a N/A car??????????
 

with header and an SAFC you could prob get a few more ponies out of it but not much.  Even still though you will feel the difference after all of these mods