hi bro...3k is quite ok for upgrading ur s4ph to be more responsive..kindly be inform u need to study first what kind of performance parts u need as a first stage to get a piece of mind after spending money. if i were u,with tt amount of money..i go for exhaust sys. nowadays to get responsive set up for exhaust aint cheap..for the whole starting with rm 1k until rm2k.. many options edy..speedworks rm2k, exss rm 2k++ bla bla..
changing spark plug to iridium also make u smiling but not much..the price roughly about rm45-50/piece
upgrading ur fuel regulator..u may use this to maintain the pressure of fuel in ur oem fuel railing..now we overwhealming with lots of product depend to ur pocket.usually price for complete set is around rm360excluded installation..
air filter...is the typical performance product tt ppl use to increase power .u can use open pod filter assits with cold air intake for better respon or else just use the simplest filter which known as drop in filter..price is around 100++
last but exluded ur rm3k budget..tune ur car..u may use ems, unichip and the price tags aint cheap bro..starts with rm1k++ or else u also can tuning ur car using pdt...price around rm100++
all above mentions is only a guidline for u bro..i already use it n its works!..u may reffer to another sifus..aim just sharing knowdledge n obviously iam nubiss...thanks..sorry for my mediocre writting..sharing is caring