The 450 requires the stock filter to be cut out to make room for the larger diameter bottom section of the pump.
I did explore making an extension kit to raise the stock filter so that the 450 could be installed without cutting it out, but I deemed it to be a waste of resources. This is because the stock filter element is not technically "rated" for e85. While I ran the stock filter with E85 for a long time without issues, it would be technically improper for me to recommend or advise others to do it, and therefore I elected to not make a product that promotes it.
Rather, I just updated all levels of the 370z fuel systems to include an external inline filter with a microglass element option for E85 compatibility. By eliminating the use of the internal filter, fuel system reliability was also increased by bypassing a potential pressure leak area (the stock filter housing). I figured all win-win with the only side effect being the kits increasing in price by the cost of a filter. Small price to pay for so much gained IMHO.
/thread hi-jack
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