I would suggest giving Mike Allen a call at Allen's exhaust, he can fix you up with one of his very nice systems or custom make one for you, and the cost is comparable to a kit from other vendors. Mike is custom building me a set of 3" side exhaust pipes for less than I could have bought a set of regular ones for from other vendors.
If you are set on Magnaflows, check out the C2 forum, those seem to be very popular mufflers.
If you are set on Magnaflows, check out the C2 forum, those seem to be very popular mufflers.