Good morning mga sir ask ko lang kung kailangan ko mag palit ng valve spring after ko mag palit ng stage 1 cam shaft and if pwedeng mag palit ng bigger injectors and how much CC do i need naka open exhaust ako at high flow racing filter. Super lean ng AFR puting puti ang sparkplug. Baka sakaling masulusyinan ng hindi kailangan mag install ng racing ECU. Thank you
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