AUTOSAVER88 Catalytic Converter Compatible with Chevy Silverado GMC Sierra 1500 1999 2000 2001 2002 2003 2004 2005 2006 Tahoe Avalanche Suburban Yukon Cadillac Escalade 4.3L 4.8L 5.3L (EPA Compliant)

Installed in a 2003 suburban LT with 5.3 lm7 (non flex fuel) It’s a little tight mounting to exhaust manifolds. The flange holes on driver side could be slightly larger. But took my time and it did fit. I didn’t use the u clamp provided I bought a SS band clamp to connect Y pipe section. Also the one O2 senor down stream after cat that’s along pass side frame rail is tight to frame. I’d suggest having a 90° adapter handy to go in that location. This has been on my truck for apprx 400+ miles and cleared my PO420 cat code. For the money I would buy this part again. I have 4 stars for mileage only cause it’s still early. 4 stars for installment cause it is tight. But if you open up the flange holes it will make it easier. Get the 90° adapter for O2 if your concerned for clearance.

I have a 99 chevy Silverado Z71 5.3 285287 miles on the ol girl an love her like the day I bought her off the show room floor .She has been faithful like all Chevys are .Unfortunately she started losing power .Replaced the intake manifold Gasket cause on this motor there notorious for leaking air on the intake manifold .still didnt solve the problem ,so I changed the fuel pump because the fuel pump pressure was at 42 psi an this motor needs 55 to 65 psi ,so installed a AC DELCO fuel pump ran a bit better but still didnt have the power it use to have .Codes were going off about the 02sensors which I had replaced recently .I notice that every time I drove the truck the temperature was running 195 to 200 an was very hot underneath the truck thats when I realized that the catalytic converters were stopped up ,So thats when I ordered these catalytic converter from Amazon an TYG or AUTOSAVER88 .I read reviews on how hard it was to install these an an things to be aware of which I found to be totally untrue . I order them Monday night an was here Wednesday Yes thats right 2 days an on my porch . So pull the truck in to my garage lifted it with floor jack just enough were I could roll underneath it with a creeper an have plenty of room ,this job start to finish took me 2 hours an 15minutes to install .Thats right that easy . I removed the O2 sensors first, then I sawzalled the catalytic converters off just like the thieves do an unbolted the existing pipes which was so easy ,The new Catalytic converters come with new studs gaskets and nuts . I didnt use any of the nuts because all the nuts that came off my manifolds were in great shape .There is no reason to remove anything like center brackets or the center transmission brace. You do not need to be a genius or a certified tech .It is a very easy job no need to over think this job .BTW my ol Chevy runs great no more engine lights and temperature is back down to 160, with the A/C on an no need to buy a knew Chevrolet pick up .If your truck is losing power an getting hot do your self favor an buy these Catalytic converter , Yes I did use a scanner but many times the scanner will give codes that are not always 100% correct especially when it comes to a stopped up catalytic converter .Im glad I replaced everything that I did .but most of all the catalytic converter. There was only one issue an that is were the rear O2 señsor goes on the passenger side ,Manufactures must know that its in a bad spot an must be addressed ,but it will work . I would definitely recommend this to anybody who needs this part. The quality is excellent an welds are magnificent

You must first meditate yourself into a state of Zen and remain calm and you will get through it with minimal collateral damage to yourself and anything within the distance that a flying wrench can reach. Once you have mastered Zen, you will need pry bars, sledge hammers, ratchet strap and a family size jar of Vaseline. It wouldn't hurt to also have some good karma built up to cash in on just in case.But seriously, it will fit and work good. No more check engine warning light coming after clearing the code, There are some good tips from other reviewers that helped a lot. Especially the one from the guy that said he used a ratchet strap. I was able to line up the bolts by using the strap to squeeze the pipes together. Great tip!My biggest problem was unrelated to the product. One of my flange nuts decided to become one with the bolt and the original exhaust flange and I stripped it beyond recognition. I tried torches, penetrating oil and all of the gimmick tools and nothing worked. This is the point where I had to tap into the wisdom of the Buddhist Zen Masters at the monastery. I am now proficient at breathing in and breathing out and smiling while I do it. In the end it was the Dremmel and a few cut off wheels that saved me from becoming a monk. In defense of the product, I suppose every truck is not exactly the same when they roll off of the assembly line so it's probably not even possible to make one that fits perfectly on every truck. It's over and that's all I care about. Now, I just need to go apologize to a few people that may have come near me during the procedure before consulting with the Buddha.

Installed loosely, worked it into place. No leaks and no codes ,so far . Certainly the less expensive option. 2000 sierra 1500 4x4 4.8 .