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are you talking 300-350whp? for an SR you can do 300whp easy without touching the internals. on a KA, 300whp can be done as long it is tuned VERY well. but i wouldnt risk it. at least get some forged pistions. stock KA pistions are cast = no bueno. 8psi is about the most you should run on a stock KA. anything more is pushing it. if your goal is 350whp, i say go SR. if you wanted like 250-270whp, id say go KAT. plenty of power and tons of TQ. and it can be reliable if done right. but if you dont want to rebuild for 300+whp, go SR.
go and pick up the new SCC mag. its got a do it yourself boost section with a bunch of different cars, including a home made S14 KAT. it will give you a better look into the world of custom KA-T setups and what you can get away with.
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