we have a sniper intake that was on both a 511 cubic inch engine and a 605 inch engine. Using it with a rons injection on alcohol on both engines. Never really could get either motor to really take off and ALWAYS had high exhaust temps (1200 deg+). after being told by profiler that there is no way to get anymore power out of the intake and "its a perfect design" and "porting it will be a waste of money" we decided to go ahead and let one of our friends who builds engines a shot at porting and "cleaning up" of the intake. After he was finished we bolted it on....added some fuel to the tune up...and picked up 2 tenths and dropped egt to 1020-1050.
i havent seen any of the later designs as ours one one of the earlier sniper II's so maybe they've gotten better. i really be interested to see how their sniper tunnel ram looks/performs.