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Best Automotive Performance Catalytic Converter Kits

Walker 16340 Ultra Domestic Converter - Non-CARB Compliant
Flange to flange, direct fit design bolts to existing exhaust.
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GReddy 10157101 Single Exit Cat-Back Exhaust System
Racing Sport Exhaust Catback, Piping 70mmExhaust Exits On Right Side AP2 Models Req AP1 Rubber Hangers Honda S2000 All 2000-2009 ALL New for 2011, GReddy Racing Sport (RS) Cat-back Exhausts combine a high flow straight-through design, polished stainless-steel construction and aggressive sound. Enter your model number to make sure this fits.
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Best Automotive Performance Catalytic Converters

MagnaFlow 93419 Direct Fit Catalytic Converter (Non CARB compliant)
MagnaFlow direct-fit catalytic converters are designed for easy bolt-on installation for the professional installer. Designed for easy bolt-on installation;Reduces harmful emissions.
Reviews
"Don't try any other way to remove the old or install the new."
"great value, comes with the gaskets and clamps."
"These mounted up really easy."
"Easy to install and fits good under 04 Silverado."
"Works great."
"It was a piece of cake installing these!"
"Mainly removing the longer section required dropping the cross brace and pulling down on it to slide pipe out."
"Had an issue with o2 sensor bung stripped out."
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Best Automotive Performance Catalytic Converter Parts

Walker 31887 Hardware Flange
Walker delivers optimal OE-style fit, appearance, and dependability in aftermarket emissions control parts. New Walker accessories help to ensure effective exhaust repairs.
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Best Automotive Performance Catalytic Converter Air Tubes

Spectre Performance 9799 4" 90 Degree Mandrel Intake Tube
Spectre tubes allow you to design your very own custom cold air intake system. Enter your model number to make sure this fits.
Reviews
"I needed a 90* 4" intake piece for the LSA install my SS sedan."
"Freedom to piece together your own 4" intake system for LS swappers, or otherwise, is awesome."
"Not sure why an aluminum elbow costs so much."
"Good quality, but not cheap."
"This product is too thin which permits the product to dent and bend, would not recommend."
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