get a v-afc. when you add the bolt-on's you increase the amount of air into the engine. the computer tries in vain to balance everything out. with the v-afc you can customize your a/f ratio while getting rid of the vtec "dip". you will still burp out a little black smoke when pushing the engine hard. esecially when the big cams take over but, it wont be as pronounced. i saw 8 hp to the wheels with the apex'i plus the regular bolt on's, jun flywheel and a cm stage 4. absolutely worth the money.