There is only 2 down sides to using the new bulkheads. 1 is you have to dremel the bulkhead and it then becomes weaker because of the lack of material next to the front screw at the rear of the topdeck on the motor side. 2 you have to take the bulkheads off if you want to change spur. But i have them on my car despite this and wouldnt take them off
p.s only broke 1 topdeck with the new bulkheads so its not that bad