I had removed the guts from my cat a few years ago and the engine would get a hellatous backfire every now and then. I had installed a new flowmaster catback and replaced the cat with a flowmaster hushmaster II and it made the engine real quiet. The fumes were not very fun so replaced it with a new cat. Little more noisy. You may not like a flowmaster alone, mine was a little to loud when i tried it. My alltimate go was to get it as quite as possible for hunting coyotes, and would install the hushmaster if I had the room. maybe by the gas tank, have to mesure later tonight.
89 Wrangler, 2.5L TBI, D30 Truetrac 4.56 gear front, Super 35 4.56 gears rear, 31" BFG Mud's, 15x9" weld racing pro-stars XP's, 2.5" rancho and 1.25" shackels, superior axles. rear wilwood disc brakes
2008 wrangler x unlimited. Stone white. Motech 5.3L LS Chevy