i have been informed by reputable tuner US standard valve spring ,retainer con rod etc can withstand up to 350 HP .hi!!mine is D15B BOT with 13B FC3S turbo plus auto gearbox.i've been using it almost 1 year & so far no problem.my injector is 450cc & 46mm waste gate dun know what brand la..2.5" downpipe,stock piston,remap ecu & boost @ 0.8 to 1.2 bar.FYI i got a complete set of manual GB now with stock flywheel & plan to convert my GB to manual.ok question..
1)do i need to replace the valve spring & retainer?
2)if yes or no..why??
3)what type/brand should i buy?how much $$$??
4)where can i get lighten flywheel?
help me plz...coz here(sarawak) difficult to get the performance parts..