I have f23a4 engine second one in this car last one I turboed. Blew engine an transmission. I want to know is there any way to get more HP out of it. Not turboing I have changed out the o2 sensors, put obx stainless headers on, megan racing high fliw cat an a greddy cat back. Plus a AEM cold air intake, AEM high volume fuel rail, high psi AEM fuel pump an lines, 350cc injectors, AEM regrind a6 camshaft an true time cam gear. Is there anything else I can do for a little more hp an tq remeber f23a4 motor an 5 speed transmission with light wieght fly wheel an stage 2 clutch. Will a h22 , h23, or a f series b cylinder head bolt to the f23 block if so witch one I would like to get a skunk2 or obx intake manifold.