Here's my "high tech" Honda GXH50 airbox...of course I was going for "retro", not performance, but I'll take what I can get. Of course I also had to replace the original airbox because it would not fit.

...and in the spirit of retro, that garish red cover color will be going away soon along with all the stickers- body color, same as the filter housing.

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29/10ths cubic inches of raw power.