Yes, there was a change between 07 and 08, then all 20rs got the same hull in 09, then other changes for 10 and 11, The newer hulls are better all around, especially 09 forward, imho.The 2011 Puma FTD is the best ive ever been in, hands down. Amazing what BCB has done the last few years in ride and performance enhancements over even their previous models. This is true of the trailers as well.