Walker Ultra EPA 50511 Direct Fit Catalytic Converter 3.625" Inlet (ID) for Chevrolet Silverado 1500
Condition: New
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30-day refund/replacement
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Availability:
Only 6 left in stock, order soon!
Arrives
Tuesday, Nov 18
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Features
- COMPATIBILITY Fits 2002-2003 Cadillac Escalade; 2002-2003 Chevrolet Avalanche 1500; 2002-2002 Chevrolet C1500; 1999-2003 Chevrolet Silverado 1500; 1999-2002 Chevrolet Silverado 1500; 1999-2001 Chevrolet Silverado 1500; 2002-2002 Chevrolet Silverado 1500
- EPA COMPLIANT -- For use on OBDII vehicles, 1996 and newer. Consult your state's aftermarket converter regulations for details.
- DIRECT-FIT DESIGN -- Direct-fit bolt-on replacement solution with OE-style hangers, brackets, routings and heat shields for easy installation that doesn't require specialized fabrication and/or welding
- ASSURED PERFORMANCE -- OE-style high-technology washcoat and optimal precious metal load delivers required reduction in tailpipe emissions to match vehicle application
- STRONG AND DURABLE -- Features thick OE-style flanges, hangers and brackets for strength and durability
- OE-STYLE DESIGN -- Features aluminized heat shields when originally equipped, to match OE design, protecting the undercarriage from heat created by the converter
- BUY WITH CONFIDENCE
Description
The Walker® Ultra 50511 catalytic converter is engineered for automotive professionals who demand precision and reliability. As a direct-fit design, this catalytic convertor ensures seamless integration into your vehicle's exhaust system, eliminating the need for cutting or welding. Constructed with durable stainless steel, it offers robust performance while complying with EPA standards for OBDII vehicles. The high-quality internal substrate is designed to optimize exhaust flow and emissions reduction, making it a dependable choice among automotive replacement catalytic converters. With its straightforward installation, this converter is ideal for technicians seeking a product that balances performance, durability, and regulatory compliance.
Manufacturer: Tenneco (Dynomax, Walker, Thrush)
Brand: Walker
Item Weight: 22.5 pounds
Product Dimensions: 46 x 8 x 6 inches
Item model number: 50511
Manufacturer Part Number: 50511
Date First Available: November 23, 2005
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Nov 18
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I just purchased this for my 03 Suburban which has 217,000 miles. I kept getting a random misfire code (P0300) and went through the entire system trying to isolate the problem. Symptoms were complete lack of power, poor fuel mileage and a regular retarding of the ignition timing. Prior to this I began hearing a crackling sound coming from beneath the truck. I never would have thought the problem was a severe exhaust restriction which came from the catalytic converter breaking down. So, on to the Walker replacement. I was concerned, at first, when I finally got the thing fitted up to the exhaust headers and the flanges didn't line up perfectly. With a little finessing, and some gentle prying, the unit finally fit. All the O2 sensors fit perfectly and I bolted everything up tight. I ran the truck after the install and it was back to it's normal self. The entire job took me ALL day (8am-11pm), but in the end was worth it. Of course, I didn't spend the entire day under the truck. Several hours were spent waiting for thd PB Blaster to loosen the nuts. Had to buy a 1/2" drive breaker bar to break them loose and ended up breaking one stud on the old y-pipe, but this was no big deal as it was one of the studs that was already pressed into thd new unit. I did have to cut one stud short on the driver side exhaust manifold, as the nut threads stripped at the bottom of the stud and just spun on the stud. Fortunately, the studs are quite long and I had ample thread left to install a new nut. I am quite satisfied with the Walker product and would recommend it as a replacement. Just be prepared for a long day's work.
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Reviewed in the United States on September 22, 2019 by Deadhead1968
I had recently purchased a Walker tailpipe and muffler. When i took my old tail pipe off at the Y pipe, I noticed my catalytic converter’s honeycombs were broken. I purchased this OEM specs Y pipe. It fit like a factory one and the craftsmanship it very detailed. Would highly recommend Walker products.
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Reviewed in the United States on October 3, 2024 by Charles R Stowers
Great fit, but only lasted three years.
Reviewed in the United States on July 21, 2025 by Matthew N
Packaging was a bit wimpy for this set as they are fairly heavy, but luckily they are rugged too and had no damage. Fit without much problems and are working great. Truck runs much smoother with these. Also swapped out all 4 Oxygen sensors too for simple peace of mind. It looked like all original equipment and the 2003 chevy silverado 1500 had 95k miles on it. No more check engine light! Would highly recommend this set to the home mechanic that wants to save hundreds of $$ rather than taking it to a shop.
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Reviewed in the United States on July 11, 2014 by Bernie
This product fits and works good. Not the quality of OEM but works just the same and we will see how it lasts. Mine did come with the flat gasket but no doughnut gasket. Had it installed in one hour.
Reviewed in the United States on October 31, 2013 by Tammy Jo McGuckin
Installed on 2002 Tahoe Z71 4WD with 222K miles and P0420 code for passenger side catalyst efficiency. Had to pry a bit to get passenger side collector studs lined up with driver side aligned, but not bad. Came with driver side manifold collector gasket (did not need the extra one suggested by Amazon - Walker 31718) - there was no old gasket on the original but I used the new gasket. Did not come with passenger side crush donut but I bought the Amazon suggested Walker 31554 - the passenger side original donut was hard and probably fine to reuse, but I used the new one which was more soft/compliant. Did not come with new nuts, but old nuts were fine on mine - threaded studs on both exhaust manifolds and on muffler end of the converter. Using air impact wrench would have been easier with deep 15mm socket due to long exhaust manifold collector studs, but was able to work around with normal length socket. All nuts require long extensions for access. Have to drop the transmission cross member to get the old converter y pipe out and new one in. I removed only 3 of 4 long bolts/nuts on cross member (2 on passenger and inner 1 on driver side) and rotated out of the way sufficiently - have to support transmission with jack/stand and also remove the two nuts attaching cross member to transmission mount. Good time to replace transmission mount if needed. Note that driver side long bolt to cross member should be reinstalled prior to tightening nuts on driver side exhaust collector since the long bolt could not be installed on mine after tightening driver side manifold nuts due to interference of long cross member bolt with the O2 sensor mount boss area on the new catalytic converter. Seems fine with no exhaust leaks on first start. Can't comment on longevity obviously, but usually that is a function of other issues such as oil getting by exhaust valve stem seals, etc - comes with note stating all the other specific issues should be fixed to ensure new converters won't be damaged over time.
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Reviewed in the United States on November 24, 2014 by OldDude2003
Installed on a 2000 Silverado 4x4. Fit perfect. Some say they had to lower the transmission cross member but I didn't. Unbolt the pipe, pull the pipe back, drop the front to the ground then slide it forward. Slid it out from the side of the truck. Tip: unbolt your front drive shaft in the front and move it to the center of the truck. This makes getting the front 02 sensor much easier to reach. the plug on the front sensor is very difficult to reach if you don't do this. Do not put the new front sensor in until the pipe is bolted up. With the drive shaft swing out of the way putting the sensor back in is a breeze. Also the Walker pipe clears the transmission pan much better then the factory pipe. Now the pipe will not need to be unbolted to get at the pan bolts and drop the pan. Well thought out.
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Reviewed in the United States on April 17, 2016 by Life is Good
Buyer, beware I bought it the item it never arrived on time, after install had an air leak by the driver's side 02 sensor. had to have it welded cost me $80.00 dollars, Buyer beware
Reviewed in the United States on September 19, 2022 by John Rhodes