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i have a stock int. kl03 and i was looking into rebuliding it with some after market parts. i wanted to port and polish the heads, put new rods and pistons in, (bore) the throttlebody, and air manifold. i know there is alot more, but cna u give me some prices on parts and where to get them from, and brand is a good brand. i have seen JE piston, mazda speed piston. help me out man thanks alot. and when i do this i was going to put on a header. i have intake and exhaust, so how much hp could be gained with this. thanks alot man