413's are the red headed stepchildren of the RB family. If you are going to foot the expense of the full MW exhaust system, you can pick up a running 413 for less than you will have in the MW exhaust system and then have a entire upgraded engine for your time and trouble and the exhaust should fit without question.

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph