volvos and saabs dont have t3/t4's...maybe straight t3's. and to get enough flow to make 300whp on your ls motor you are most likely gonna need more that a stock internally gated volvo turbo. becuase #1 it probably will not support that power level and #2 you would be spinning the piss out of it to make high boost to get you there....that would ruin the efficiency of the turbo. i cant tell ppl this enough...just drop 3g's on a good kit and be happy with the results. i have seen so many ppl go the cheap way only to be dissapointed with the end result when shit is breaking and/or the car is just slow. im not saying it cant be done but seriously if you spend the money right the first time you will be so happy you did.