Exhaust size, mufflers, pipes are all different between a 97-2002 and the old boats. A Lazair has 3.5" pipes with turn down tips & a crossover pipe, which results in more power, less noise on the lake. The old boats had 3" pipes and nobody cared about noise, for most louder was better. Sealing the Lazair tank/platform to the transom is problematic, The last one I fixed I used the dreaded 3M5200 caulk and sealed the entire bottom & side after cleaning, silicone over the top joint, that worked. Now if the platform ever needs to come off I will defer that boat to my brother.