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supercharge at high psi will keep you there , but cost more
+1. Supercharger setups cost less than turbos. You can get to 300 hp with around 9 psi of boost (been there!). But then you really also need a rear end setup that can take the power, too! 300 and more hp is possible for $4-5K.
supercharger i would say nitrous but that will put u in alot of money in the long run unless u have the setup for it with forged pistons and all or u could go with gears, cold air intake, plenum and throttle body and exhaust and a good tune