Which cat for true dual on a C3?
Thread Starter
Instructor
Joined: Jan 2002
Posts: 100
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Which cat for true dual on a C3?
I want to get a couple of catalytic converters for my '75's new exhaust system. Which cats should I use? Summit carries Catco and Dynomax. Has anyone used either of these? Which cats shouldn't I use?
Race Director
Joined: Mar 1999
Posts: 12,597
Likes: 237
From: Bartlett Illinois
Re: Which cat for true dual on a C3? (fwayne)
how much room do you have?
You might want to find Carsound cats.. I think internet racers supply has them http://www.racenet.net
or get Random Tech cats.. but buy them from More Performance, The have better prices then Random http://www.moreperformanceinc.com/
You might want to find Carsound cats.. I think internet racers supply has them http://www.racenet.net
or get Random Tech cats.. but buy them from More Performance, The have better prices then Random http://www.moreperformanceinc.com/
Thread Starter
Instructor
Joined: Jan 2002
Posts: 100
Likes: 0
Re: Which cat for true dual on a C3? (-=Jeff=-)
Thanks for the advice. I went to the web sites and checked out the prices for a Chevy 5.7L application (I can't find any universal cat prices!). Damn, they're expensive!
Being on the chronological fringe of exhaust catalyst implementations :D in my '75, I'm thinking about buying the cheapest cats I can, putting flanges on them, having some replacement pipes with flanges made that fit the gap, and putting the pipes in there instead. Even better flow. Less money. Raw exhaust smell! And I have the cats ready to swap in just in case I need them.
What's the chance that I would need them? Does anyone know how strict emission checks are in the Chicago area?
Being on the chronological fringe of exhaust catalyst implementations :D in my '75, I'm thinking about buying the cheapest cats I can, putting flanges on them, having some replacement pipes with flanges made that fit the gap, and putting the pipes in there instead. Even better flow. Less money. Raw exhaust smell! And I have the cats ready to swap in just in case I need them.
What's the chance that I would need them? Does anyone know how strict emission checks are in the Chicago area?
Drifting
Joined: Jan 2002
Posts: 1,484
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From: Northampton Ma
Re: Which cat for true dual on a C3? (fwayne)
New cats? since your car is a '75 you don't have to pass emmissions (atleast here in Massachusetts), so if that's the case in your state, you can dump the cats altogether and use straight pipe and free up some serious horsepower. But, if you have to keep your cats make sure that you get "high flow" or "free flow" cats to maximize the horsepower. Most 'Vette places sell them (i.e., Eckler's, Zip, Corvette Central, etc.). And you may want to throw in an H-pipe if you don't already have one. Hope this helps.
