We had to replace the 6 year old Dynomax I installed back in '09 on the ZJ because it was getting raspy and rattly. A local shop does all Flowmaster systems so they suggested the Flowmaster 40 and installed that and the pipes all welded. It sounds great, not loud but has a nice low tone better than the Dynomax which was not bad. So for anyone wanting a nice low tone on their 4.0 Jeep six the Flowmaster 40 will not be too loud as some might think....
ZJ exhaust....
