73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Topic started by: tmac122 on August 31, 2011, 10:17:49 PM
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I have got a '80 c-20 with a 350 and i think it is time for a new exhaust since mine are completely rusted. If you know of and sites or anything on ebay please let me know.
thanks
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ebay stuff you get what you pay for, unless its name brand stuff. but get some headers from summitracing.com or jegs.com or ebay if you can find them on there. buy some high flow cats, a h or x pipe and mufflers and throw them on there. then some 45s and stick them out before the tires. chris sells a cat back system i think in his store but hes on vacation till the 5th
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Cats? really?
I thought that none of the trucks needed cats.
I just put some long tube heddman headers on mine, fit nicely with no spark plug interference, not bad for 160 bucks.
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depends on the year and state
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All vehicles require cats except if they come from the factory that way. Even if you have historic tags which are inspection free, you have to have cats. But as long as your not a idiot and pipe a cop your usually good, that being said on my 86 I removed the cat and lost power due to lack of back pressure. Granted it gained on the upper end but we aint driving no scooters we need the lower end and that’s what I lost.
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Does the "H" and "x" pipes help with the back pressure? or what kind of improvement do they make?
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they do and they help equalize the pressure so both sides are working together and sound will be better. if you can go with a x pipe if you cant at least do a H pipe
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cats are supposed to be on 79 and up C20s. if they don't test you though, i would bother with them.
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cats are supposed to be on 79 and up C20s. if they don't test you though, i would bother with them.
Based on GVW Ken, my 85 C20 rolled out of the factory without Cats. They are really inexpensive for replacements, I bought a pair shipping included for less than $100 to my door.
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u can a whole exhaust from hooker. they make two kits. one for headers and one for maniflods. and it cost like 150
and most states that do the testing dont check trucks that old for cat i have a 82 and ive never been ask if i have cats on it. most of the time they will check like 90s and up for cats.
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in md they lift the vehicles up on a lift. in de they take a mirror and look under the vehicle. 96 newer will kick a code if you remove it unless you do a ainti-fowler mod
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In AZ they test you hard. They use a mirror to check for cats, the will fail you if you dont have the equipment that was originally place in your truck. Like if you have a smog pump, egr, vac canisters, cats, etc. they will fail you if your missing any of it. If you have 1 charcoal canister instead of 2, fail. If you dont have your pcv hooked up, fail. They even check your gas cap to make sure it doesnt leak.
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To confuse the issue further :-\, you may want to read this:
http://www.castheads.com/2into1_systems.php
http://www.castheads.com/faqs_exhaust_manifolds.php
Apparently, 2 exhaust pipes blending into one after the exh manifolds/headers is better than straight dual exhaust----or is it?
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Thankfully Nebraska has no emissions laws, just suggestions. For now :-\
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stew this maybe right but. they are trying to sell something. almost like the tornado, if it kind of make sense then who wouldnt want to buy it. but at the same time look at every race application like nascar and every dyno has duals
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a nicely built single exhaust will flow very well also though. i do agree though in the right aplacation a ual setup will be better but both have there place. i had a nice single 3in system on my 86 k10 with longtubes and a straight though style muffler with dumped tail pipes and it worked great. had a single 3.5in system on my 82 trans am and it preformed much better than the dual 2 1/2 setup it had before plus it was quieter with the single exhaust with the cutout closed which was nice sometimes lol.
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I've run duals and singles as well as different headers. On my trucks I have always liked single exhaust and will never buy headers that are not cereamic coated. One of the hold ups on getting my choptop on the road is saving for headers. 2-1/8 inch primary, ceramic headers aren't cheap. This is on a well built 427, I wouldn't drop too much $ on a stock built engine but I would get coated headers anyway