bought this for my truck to pass smog here in Ca. after reciving the unit had to buy slighty smaller bolts and nuts for mouting b/c the stock cat had the threds in the mouting flanges and this unit did not was just regular holes though them. was also slighty shoter than the stock unit had to ajust the the pipe alittle to mate up to the unit but evrything matched up good. No leaks. Went to smoge and passed w/ flyng colours. for the price was well worth it did it myself and saved $300.00 to have it done at the shop. for aboute $100.00 this cat is a vary good bargain. The only reason that I gave it. 4 stars instead of 5 was due to the trouble finding the bolts at the hardwhere store for about $2.00 adjusting the taile pipe forward. other than that good bargain.would recommend this for anybody that has a bolt on unit on there truck or car.