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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: dar06003 on September 04, 2016, 01:23:29 am

Title: True dual exhaust system on 84 C10
Post by: dar06003 on September 04, 2016, 01:23:29 am
Can I run a true dual header back exhaust system on my Chevy C10 that has a 700r4 transmission? It has a y pipe now that runs down the driver side and dual tailpipes after the muffler
Title: Re: True dual exhaust system on 84 C10
Post by: LTZ C20 on September 04, 2016, 11:06:08 am
Sure. Unless you have smog testing then it depends on your state's smog requirements.
Title: Re: True dual exhaust system on 84 C10
Post by: Captain Swampy on September 04, 2016, 12:03:32 pm
Yes, we have a dual exhaust on Brooke's 87.
Title: Re: True dual exhaust system on 84 C10
Post by: dar06003 on September 04, 2016, 01:12:20 pm
Does the stock 700r4 crossmember cause any clearance issues, I've seen some cases where a new crossmember has to be installed? I don't know if that's the case for my example


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Title: Re: True dual exhaust system on 84 C10
Post by: dar06003 on September 04, 2016, 01:24:15 pm
Also can you install a catalytic converter on each pipe? My state doesn't have emissions testing, but I'm just wondering if I wanted to retain that feature can I?


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Title: Re: True dual exhaust system on 84 C10
Post by: LTZ C20 on September 04, 2016, 02:05:43 pm
Quote from: dar06003 on September 04, 2016, 01:12:20 pm
Does the stock 700r4 crossmember cause any clearance issues, I've seen some cases where a new crossmember has to be installed? I don't know if that's the case for my example


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I have a 700 in my 73 and the stock crossmember. Any competent exhaust shop should be able to install pipes without interfering with anything.
Title: Re: True dual exhaust system on 84 C10
Post by: LTZ C20 on September 04, 2016, 02:14:33 pm
Quote from: dar06003 on September 04, 2016, 01:24:15 pm
Also can you install a catalytic converter on each pipe? My state doesn't have emissions testing, but I'm just wondering if I wanted to retain that feature can I?


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You can but why bother? They are an emissions item, nothing else. I wouldn't bother putting them back in unless they were required. You would be lucky to ever see a noticeable difference in engine performance. If it's not required by law, I would toss it.
Title: Re: True dual exhaust system on 84 C10
Post by: Irish_Alley on September 04, 2016, 03:08:18 pm
its a big fine for a shop to remove cats and not replace them. doesnt have to be oem but federal law says if it came from the factory then it has to be there. you can find shops that will do this, and you can do it yourself. i know im my state/s maryland and delaware they dont test emissions depending on your county but they will do a visual check at the least. if you get pulled over for having a truck too loud they can issue you an inspection ticket which means you have to get your truck inspected. you can add hi flow cats and they will pass in most states
Title: Re: True dual exhaust system on 84 C10
Post by: LTZ C20 on September 04, 2016, 03:34:40 pm
But only if the area the vehicle is registered in requires the emissions equipment to remain intact and functional. And the legal requirements very dependent on the year of the vehicle. Best thing to do is check the emissions requirements for the area your truck is registered in.
Title: Re: True dual exhaust system on 84 C10
Post by: Irish_Alley on September 04, 2016, 04:17:14 pm
i thought federal law trumps any state or local law?
Title: Re: True dual exhaust system on 84 C10
Post by: LTZ C20 on September 04, 2016, 05:06:18 pm
Emissions requirements are generally dependent on the area of registration. Like in my county and most in California, all factory emissions equipment are required on all vehicles 1976 to present that are registered for on public road use. But there are a few counties that don't have any requirements and one county that you must pass once when you register initially but any registrations after that don't require any type of emissions testing. New vehicles are smog exempt for the first couple years after purchase. But something such as Diesel Exhaust Fluid is required on all vehicles in all 50 states 2011 (I think) and newer regardless of individual area requirements.

If your worried about it, just check your areas requirements, it's that easy, then you know what you can and can't do. Heck you could call a reputable smog shop in the area and ask what the requirements are.
Title: Re: True dual exhaust system on 84 C10
Post by: dar06003 on September 04, 2016, 06:33:06 pm
Thanks for all the responses everyone, I might not even bother with the catalytic converter. I live in Oklahoma, so no cats is probably common haha


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Title: Re: True dual exhaust system on 84 C10
Post by: Irish_Alley on September 04, 2016, 06:43:56 pm
most time if you keep the noise down then cops wont even bother you. if you draw attention to yourself with noise or spinning tires or acting a fool thats when they will find every little thing wrong
Title: Re: True dual exhaust system on 84 C10
Post by: philo_beddoe on September 07, 2016, 07:19:41 am
Quote from: Irish_Alley on September 04, 2016, 06:43:56 pm
most time if you keep the noise down then cops wont even bother you. if you draw attention to yourself with noise or spinning tires or acting a fool thats when they will find every little thing wrong
Or having big fat loud tractor pipes sticking out of the front corners of the bed.
Title: Re: True dual exhaust system on 84 C10
Post by: Irish_Alley on September 07, 2016, 07:21:30 am
Quote from: philo_beddoe on September 07, 2016, 07:19:41 am
Quote from: Irish_Alley on September 04, 2016, 06:43:56 pm
most time if you keep the noise down then cops wont even bother you. if you draw attention to yourself with noise or spinning tires or acting a fool thats when they will find every little thing wrong
Or having big fat loud tractor pipes sticking out of the front corners of the bed.

(http://www.naioa.com/v2/modules/Forums/images/smiles/eusa_whistle.gif)
Title: Re: True dual exhaust system on 84 C10
Post by: philo_beddoe on September 07, 2016, 02:07:47 pm
Uh oh....whoops, i get it.
Title: Re: True dual exhaust system on 84 C10
Post by: zieg85 on September 07, 2016, 02:47:54 pm
Back in the late 80's I worked for a muffler and brake shop.  EPA was doing stings and handing out $10,000 fines to those shops deleting convertors.  Most often they would pose as customers coming in for an exhaust repair, pulling in with a test tube in place of a convertor.  If the shop refused to work on the car unless a new one was installed they were fine.  If they did the work bamo... Put a few shops out of business.
Title: Re: True dual exhaust system on 84 C10
Post by: Irish_Alley on September 07, 2016, 04:12:38 pm
when i took my 91 v3500 cummins to the exhaust shop the lady didnt want to touch it cause i left the stock exhaust in place with the cat still on. she said they would have to put a cat on. i explained that was with the gas motor and it had cali emissions. now it has a diesel and it doesnt have emissions, i understood what she was saying and she was only covering her butt
Title: Re: True dual exhaust system on 84 C10
Post by: philo_beddoe on September 07, 2016, 04:41:26 pm
No emissions in MA if 15 yrs or older. Best law ever!
Title: Re: True dual exhaust system on 84 C10
Post by: Irish_Alley on September 07, 2016, 04:48:01 pm
in maryland you only have to get it inspected once. the county i live in they only do a visual. but if it came from the factory with a cat its against federal law to remove it no matter what county you live in
Title: Re: True dual exhaust system on 84 C10
Post by: philo_beddoe on September 07, 2016, 08:55:25 pm
Not here. (If 15 yrs or older), and were such a blue liberal state. Go figure.