What we're looking at is finding the happy medium.. Greg thought the collector he built before was a little small for what we're trying to do now.. Greg is also the one that chose where to put the bung these collectors are very short and so I think if you moved the bung towards the rear it may pull in clean air.. I will say that there's a possibility with a converter change and gear change I could take advantage of the larger collector.. but some of these science projects can become expensive