I have been out of iroc's for a couple of years. My last iroc was a vortec heads, stealth ram and lt4 hotcam setup. i liked that setup but if a decide to mod my new iroc i would like to keep the tpi setup. what direction offers the most promise. something along the lines of a vortec heads, tpi base long tubes or a afr's with long tubes or siam. runners? also does anybody sell siam base or runners? i like the idea of long tubes because they look stock. thanks