I have an 07 35' Adventurer Ford V-10 with Banks complete exhaust system.
This engine had 362 HP from the factory, With the Banks, it is near or over 400 HP.
You can feel the difference especially climbing hills where I can go about 50 mph up a 6% grade.
The engine develops that power near 5000 rpm, so expect much noise. It does help, even at around 3000 rpm, if you want to stay quieter.
You're obviously looking for more power, I say, go for it. You'll like it.