K&B
I use a 7.5 rear intake K$B on my hyper40 with a apc 9+9 but Iam burning 30% nitro and a full unmuffled pipe, they are drum and not disk like chuck thought, works good but not the real hot set up,the new 48 is alot better, but is bucks and hard to get, but you may have the same problem, I don't know the specs off hand,