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Discussion Starter #1
i cannot find the thread that had 4 main engine parts i can upgrade had the names and what part to replace.

short ram
exhaust system
intake manifold
exhaust manifold

im not looking for 200hp increase im looking for at least 30-50hp increase with out a turbo, once i get those parts then ill get a turbo.
 

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I'm new the scion scene, but I had the 1.5 in my Yaris since 2010. I think your more likely to see a 6~10 HP increase with those mods(if they are quality parts).

You'd be better off(imo)removing the head, and taking it to a good machinist for a port job and oversized valves. Also get a larger throttle body, and larger injectors. This would most likely get you up around 150 HP.
 

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Yeah, what he ^ said. If you're looking for 30-50 hp Nitrous is your best bet on our small 1.5L engines. Without doing serious internal engine work or using a power adder (turbo,supercharger,nitrous) you just won't see 30-50hp.
 
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