Never heard of a Typhoon rotor but, did see a Slip on test result on the Lexx pipe in Quad Magazine. Supposedly they arent too bad but the packing failed really fast and they dont offer a full exhaust. Also the fitment was a little off.
Tusk products arent to bad at all. I have a set of Tusk Nerfs and they have held up better than the AC's and Raths that I've owned. There are several that will oppose to RMatvs tusk products but, They are very good products.