Public service announcement on the Sniper. Regardless if you're buying one of our "CTF" fuel injected engines, or if you're purchasing the sniper directly from us by itself as a 550-510 / 550-511... You CANNOT run these without the oxygen sensor properly installed. We have had an increasing amount of customers that wanted to "just hear the engine run" or "just move the car a few feet" and have either left the 02 sensor unhooked, or tried to dangle it in front of an open header. If you do the above, you will end up with 8 fouled spark plugs in a very short matter of time. the system reverts to full rich, and carbons up plugs in a matter of minutes. the O2 sensor is advised to be mounted at least 18 inches from the tailpipe exit, and 6 inches after the collector merge to get a good signal from the entire bank. public service announcement from the day any questions let me know, and i'm happy to get anyone a sniper, and the supported ignition equipment, right from BluePrint Engines! or better yet! a fuel injected mopar 408!