can anyone tell wot might be the problem. turbo lag is real bad on initial move off in 1st and 2nd, it boosts around 1.5 but only last for a second or two then seems to drag, its suppose to be 280bhp, feels more like 180, can anyone help. ive got a apexi rsm fitted but have no manual, and defi gauges if that helps

 

Have you tried conecting the wires under dash can't remmeber colours for checking fault codes and a jdm has more than 280bhp .I have 05jdm sti and that feels more like 310-315bhp