Exhaust Question

[legopnuematic]

$221.00 from Summit for manifold back dual kit Just pick your offset in/out mufflers.

But a nice single exhaust isn't bad either.

You could fab up an all stainless side pipe exhaust.

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Was about $400 to do that with me fabbing everything up. Pipes, mufflers, bends, flex, vee bands. Not including cost of headers as I had traded labor for them.

But should last forever.

 

[Confused]

For a single exhaust pick the longest muffler you can get under there.The longer the case the quieter the muffler.On a single exhaust 305 it will only be so loud anyway.It depends on what you want. A 20" case dynomax Super Turbo will sound nice and give a little more flow.

 

[bucket]

Everyone is overlooking pipe size. A single 2" or 2.25" exhaust pipe is fairly restrictive, even for a stock 305.

Also, ANY V8 can sound good and have a noticeable, healthy exhaust rumble if that's what you want. If it sounds like a$$, you're doing it wrong.

 

[Ken B]

I am not looking for rumble...just adequate flow. Sounds like 2.25 single is restrictive?

..

 

[bucket]

I am not looking for rumble...just adequate flow. Sounds like 2.25 single is restrictive?

..

2.5" would be ideal I'd think. 2.25" before the merge would be fine.

 

[ali_c20]

My K5 (350) setup is 2.25" and merge in a 3" pipe with a big muffler. Muffler is perforated tube with packing. Pulls good (as good as 260hp crate pulls ) and has a nice deep not loud tone.

 

[Latetotheparty]

Similar to OP, I have new to me, '86 C10 with 305. Has full registration i.e. not antique plates. Not daily driven, but used beyond the antique plate limits. Truck has a cobbled together single system (no cats! ugg). Needs complete replacement and cat install to get past the VA safety check. This truck will get an LS swap soon, but for now, I need to get it safety inspected. My options as I see them, comments or adds from anyone who has been down this road would be much appreciated...

1. head over to Midas (or other), and have them install a factory replacement single with cat. Deal with mods after LS swap. Muffler shop may not want to modify pre-cat to accommodate LS and/or headers. Might also be a bit restrictive for an LS.
2. buy Dynomax dual kit 89006 from Summit (https://www.summitracing.com/parts/wlk-89006/make/chevrolet/model/c10/year/1986, or similar), add mufflers and dual cats. Self install is ok, and requires some fab to cut in cats. Not stock, but should past a cursory safety inspector just looking for cats. Might be easiest cat compliant transition to an LS setup.
3. go back to DMV and register as antique and forget about the cats since this avoids safety inspection entirely. Requires some bending of usage limits with antique plates. Most flexible option for exhaust install.

Lemme know what y'all think...

​

 

[bucket]

Similar to OP, I have new to me, '86 C10 with 305. Has full registration i.e. not antique plates. Not daily driven, but used beyond the antique plate limits. Truck has a cobbled together single system (no cats! ugg). Needs complete replacement and cat install to get past the VA safety check. This truck will get an LS swap soon, but for now, I need to get it safety inspected. My options as I see them, comments or adds from anyone who has been down this road would be much appreciated...

1. head over to Midas (or other), and have them install a factory replacement single with cat. Deal with mods after LS swap. Muffler shop may not want to modify pre-cat to accommodate LS and/or headers. Might also be a bit restrictive for an LS.
2. buy Dynomax dual kit 89006 from Summit (https://www.summitracing.com/parts/wlk-89006/make/chevrolet/model/c10/year/1986, or similar), add mufflers and dual cats. Self install is ok, and requires some fab to cut in cats. Not stock, but should past a cursory safety inspector just looking for cats. Might be easiest cat compliant transition to an LS setup.
3. go back to DMV and register as antique and forget about the cats since this avoids safety inspection entirely. Requires some bending of usage limits with antique plates. Most flexible option for exhaust install.

Lemme know what y'all think...

​

I'd pick option #3, but then register it properly after your LS swap, if you find yourself driving it well outside the limits of the antique tag. Probably cheaper than doing the exhaust twice.

 

[Grit dog]

What would a 19 year old @Ken B say to you if he had the chance? Save a few bucks or go buckwild…

Dual 2.25” & a set of turbo mufflers sure do make a stock small block sound good

Well , 52 year old Grit dog decided that 10 year old grit dogs favorite exhaust was the quick and easy answer. Side pipes ftw!

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[projo198]

Late to the conversation, but if you can weld dual exhaust is very easy to run and Flowmaster's patent on their 40 series mufflers ran out years ago so there are tons of cheap options on the market now.

 

[Camar068]

Not enough power to flex the sound of 40s imo. Will just still be slow and sound like the exhaust fell off.
I believe cars shouldn’t be any louder than they are fast or powerful.
A loud ass fart can on a 4cyl Hyundai is an example of what not to do imo.

yeh I know...getting old...a month late but....

lol I wish I had 2 fart cans when I fart....be cool for the mids/highs to be in stereo.

 

[Catbox]

This is "just" a 307 with Vortec heads and a small RV cam in it and 9.3:1 compression....

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It currently has 1979 Malibu iron manifolds on it, they are terrible for flow but needed for the outlet position.
From there it is 2 inch or so downpipes to where the header collectors would be in the future.
From there it is full mandrel bent 3 inch all the way out under the rear bumper.

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It came to us with the small pipes that were 2-1/8 or so and you could hear they were restrictive with the speed shop mufflers on it.
Now, it is fairly furious sounding and a total blast to ride it.

The one, two shift hits hard and with the 4:10's in the rear it scoots much faster than "just" a 307 should.
Don't downplay the engine size, it is still a small block and will greatly benefit from having a properly sized exhaust on it.

I wouldn't use less than 2-1/2 inch piping for a set of duals and for a single it should be 3 inch.

 

[bucket]

This is "just" a 307 with Vortec heads and a small RV cam in it and 9.3:1 compression....

xc_hide_links_from_guests_guests_error_hide_media

It currently has 1979 Malibu iron manifolds on it, they are terrible for flow but needed for the outlet position.
From there it is 2 inch or so downpipes to where the header collectors would be in the future.
From there it is full mandrel bent 3 inch all the way out under the rear bumper.

You must be registered for see images attach

It came to us with the small pipes that were 2-1/8 or so and you could hear they were restrictive with the speed shop mufflers on it.
Now, it is fairly furious sounding and a total blast to ride it.

The one, two shift hits hard and with the 4:10's in the rear it scoots much faster than "just" a 307 should.
Don't downplay the engine size, it is still a small block and will greatly benefit from having a properly sized exhaust on it.

I wouldn't use less than 2-1/2 inch piping for a set of duals and for a single it should be 3 inch.

Like I said before, ANY V8 can sound good. I'm betting that video of yours doesn't do it enough justice either. When I've tried to record my exhausts with my phone, there's a lot lost.

 

[BryanS]

If you want a nice mellow, straight-through muffler, take a look at Magnaflow. I have them with duals and an H-pipe and it has strong V8 sound without being excessively loud. Flowmasters are also a common choice, but I'm not really crazy about the tone and/or the drone at certain speeds.

If you are considering switching to duals I would just get a price from a local exhaust place. I did it myself in the driveway with the truck on ramps, and its mostly a PIA unless you like working flat on your back with rust and dirt falling on you. The cost also adds up when you buy a complete exhaust, add in 2 mufflers, and then make several trips to the store to get hangars and other odds and ends.

Also take a look at the store brand mufflers from Summit and Jegs. Many of them are just rebranded from mainstream companies, but you aren't paying for the name brand.

+1 on the magnaflow.

I put a pair on my K5 and at idle they are pretty quiet. Low rumble but not loud. I have a 454 with headers and it sounds wicked when i get on it.

If you are running stock exhaust with cat I’m not sure how much louder it would be if though

 

[BigT]

I'm considering a Summit setup myself - https://www.summitracing.com/parts/big-52525flt

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with these mufflers - https://www.summitracing.com/parts/big-52525flt. 350 with stock manifolds. Thoughts?

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