Power valve options

Vumad

Super Hero, with a cape!
Location
St. Pete, FL
The stock cylinders have a very nice smooth powerband but lack a lot of the power that ported motors do, but ported motors lose the linear band and sacrifice something somewhere. Are there any options for powervalve top end kits that are a direct replacement for the OEM cylinders? Something that is in the 700-800cc range that do not require the case modifications that the larger options need (like the XS900).
 
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