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how would you route side pipe exhaust 95 g20
#668582 August 15th 2014 12:03 pm
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So while I am waiting on suspension parts to come in the mail I am looking into working on side pipes for my 95 shorty. My question to you more knowledgeable people is how would you route the exhaust? Currently it is the stock Y pipe into 2 1/2 or 3" exhaust and one large round muffler.

I am looking at getting a set of patriot side pipes, they offer a 70 or 80" which I am not sure which size to get. I do not know how far from the front when the pipes will bend out to be exposed...im guessing 70" is good?

Now would you run straight dual exhaust with or without cats, or tie both pipes together into one cat and then into the separate pipes? I have the 3 wire heated 02 sensor in the factory y Pipe which is nice, but I hear the Y pipe is terrible for flow and kills a ton of HP.

My goal is not to get the most HP, but looks and keep the current or get better MPG

Re: how would you route side pipe exhaust 95 g20
Maciej102 #668590 August 15th 2014 2:23 pm
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Excellent question. If yours is the same as my 1992, you only have one O2 sensor. So you need to combine exhaust for oxygen reading and then split for side pipes. Ugly at best. I wouldnt expect any power or mpg increase from side pipes. But they are pretty awesome.



1992 Chevy G20, 110" wheelbase, Mark III conversion, L31/4L80e swap, Express wiring harness.
Re: how would you route side pipe exhaust 95 g20
Maciej102 #668611 August 15th 2014 6:30 pm
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Thats what I was thinking, probably save some mooolah by reusing the existing y pipe, forget a cat and just split the exhaust from the y pipe into the sides. I found a set on amazon for 200 and im thinking install shouldnt be more than 100 150 tops. Once the chrome takes a dump I will have them ceramic coated.

Re: how would you route side pipe exhaust 95 g20
Maciej102 #668622 August 15th 2014 9:43 pm
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I was thinking a bolted flange before each sidepipe would allow you to easily remove it to paint/recoat it, etc. You may need to double back from y pipe to side pipes. I would just carry a spray can of silver paint to keep up appearances. Im interested in what you do. I now have two cats with 4 oxygen sensors with my 2001 harness so it would allow me to run true duals to sidepipes. I think about this a lot.



1992 Chevy G20, 110" wheelbase, Mark III conversion, L31/4L80e swap, Express wiring harness.
Re: how would you route side pipe exhaust 95 g20
Maciej102 #668626 August 15th 2014 11:00 pm
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I think the y pipe into two will help with back pressure since I do not have a cat, last thing I want to deal with is burnt valves or wacky sensors in the emission system. Loosing any low end torque is the last thing I want to do.

Last edited by Maciej102; August 15th 2014 11:00 pm.
Re: how would you route side pipe exhaust 95 g20
Maciej102 #668639 August 16th 2014 6:56 am
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Howabout....Scrap the Y pipe run it into two parallel pipes with a equalising pipe between them (into which you can insert your O2 sensor), then into muffers then double back to connect to the side pipes.


79 chevy G30 cobra camper conversion.
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Re: how would you route side pipe exhaust 95 g20
Maciej102 #669029 August 20th 2014 11:25 pm
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There are also people running dual exhaust to in front of the rear wheel and cutting a hole in the back of the side pipe and running the exhaust into the side pipe so it sounds and looks like the side pipe is hooked up. This will solve 2 other problems 1 the pipes won't get hot 2 the chrome in the collector area stays nice for a long time cause it doesn't heat and cool. Just throwing this option out here, if I had them I would probably prefer to hook them up. There is also another option of using a muffler that has the inlet and outlet on the same side (the exhaust does a U-turn in the muffler) this option is real convenient if you have headers.


Munzvan@aol.com / Runnin Wild Truckers / I never met a van I didn't like.
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Re: how would you route side pipe exhaust 95 g20
Maciej102 #669036 August 21st 2014 12:41 am
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Would pipes with baffles be the same as a muffler or less restrictive? I have kinda narrowed my code 32 to the current exhaust being too free flowing. Lots of guys have said that after free flowing exhaust change they have gotten the code


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