the vmax 4 still has all the tools to do seroius damge omn these tripple cats as mine has done it to three of them and knowing mine is running like a tolit bowl lol i run them down from behind very good set up on the whal drag chassi just low engagement and only pulling 8500 should be 9700 on big bore 866 also compression is down 110 on 2 cyl and 120 and 140 on the renicked cyl so looks like i have to renic the other 3 then i,m good. now my nytro is a drag king in the 600 class got first in the stock 600 class and was 50 feet short of 1st place in the improved class , had 2 go threw 3 heats of 4 to get in the 600 snow pro class and got a 3rd place finish, was just short about 70 feet of being in the 700 stock final. thats on a 650 foot track, have been radared at 82 miles an hour on a 500 foot track pulling 8200 should be 8900 and thats on a 153 inch track most of these sleds got a 121 or 136 1 1/2 inch