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Ok so I'm just wondering how far we can bore our cylinders out on the SPIs. I'd like to also go forged pistons as well.
 

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Because I want to increase the volume and get a little more power.
Good luck with that venture. Previous SPI owner myself. For what you spend you won't get gains worth your time. The SPI is an economy motor. It starts 20-30hp less than the zetec. You could have piston, intake, exhaust, tune, etc and it wouldn't add up to a stock zetec. Not bumming you down by any means. Just being an honest forumgoer.


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For all you would spend get a zetec or better yet a 2.3 out of a 03 or 04. My old focus with stock 2.3 would walk away from zetec's all day long with ease.

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