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i have a 1977 f150 with a 400 and i need some cats to pass emmisions, its a duel exaust running from the headers to muffflers, so i know for sure it wont pass. now the guys at autozone say one for a 400 is 150$ right? so this is my question... since it is a duel exaust can i get a smaller cat for each side and be a lil easier on my pocket? ive came to you guys about my 79 bronco questions so i trust MOST of your opinions... just if you could help me out it would be very appeciated
 

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yo,
Walker, who has been an OEM supplier to Ford for many years has a Standard Universal 15146
1977 - Ford F-150 6.6 Liter V8

Not legal for sale on vehicles licensed in the state of California

Inlet Quantity 1
Inlet Inner Diameter 2 1/2"
Outlet Quantity 1
Outlet Inner Diameter 2 1/2"
Overall Length 18"
Catalytic Converter Type 2 Way/3 Way/3 Way + Air
Body Type Large Oval
Feature and Benefit Walker® Standard Catalytic Converters, available for Pre-OBD (1995 and older) vehicles are engineered with durable stainless steel bodies. Walker® Catalytic Converters, an industry leader for import and domestic applications, meet EPA emission requirements, and have a 25,000-mile catalytic performance warranty, in addition to a 5-year/50,000-mile structural integrity warranty.
Designed for use on Pre-OBDII vehicles. (1995 and older)
Stainless steel body, heat-shielded pipe and structural brace for enhanced strength and durability.
Meet EPA emission requirements

May need an adapter; available in many stores.

$115.99 Ships 12/23/11 @ http://www.jegs.com/i/Dynomax/289/15146/10002/-1?parentProductId=744730


$122.79 @ http://www.rockauto.com/catalog/raframecatalog.php?catalog=9&partnum=15146&a=FR9-15146-115108
 

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Normally, I'd just say that a good flowing cat would do the trick. I used a $60 cat on my single exhaust and pass emissions with a 4bbl (stock was a 1bbl).

However, you're in Arizona, which in many places has stricter exhaust regulations than even California. Since that's the case, I'd highly recommend asking a professional exhaust shop their opinion.
 
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