I am looking at a new exmark 48 hydro fixed deck 15hp. kaw. twin( last years model). pistol grips for 3300.00. price seems good but i have acouple of questions. is the 15 hp. big enough to mow high speed and get a good cut? can you run doubles on a 15 hp. hydro or is it to weak. thanks alot i am new and have really learned alot on this site. thanks again Rich.