stock exhaust tubing measurement

Save yourself the hassle and just do the catback.

Down the road when you decide to do a midpipe/headers the catback will match up and you wont have to redo it.
 
does the american thunder catback from flowmaster come with the flowmaster 40 mufflers? thats the thing...i heard a clip with american thunder catback and flowmaster 40's and i liked the second one best, but maybe i could just get some tubing from flowmaster to match the 40s? any ideas?
thanks.