Anyone still making exhaust systems for 1st Gen K5's? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

harrij4 · 10-04-2021, 03:34 PM

In a usual "slippery slope" situation, what started as a project to add a crossover (H-Pipe) to my '72 K5 with a 350, has now become a project to replace the entire exhaust system in order to clean things up, relocate the exhaust exits, and tone down the overall exhaust note a bit.

Now, the question - Does anyone still make kits for these things? The closest I could find is this Flowmaster kit for a K10. I'm assuming that should fit, but I'd rather have 304SS instead of 409SS.

https://www.holley.com/products/exha...r/parts/817940

Otherwise I'm going to buy a bunch of tubing and mandrel bends and going the DIY route.

1970BannerBlazer · 10-04-2021, 04:42 PM

For the price of the Holley kits I would just have a shop custom make a system. Depending on where you live it should be around $1,000.

Now if you have the skills to DIY, then I would go that route.

truckster · 10-04-2021, 06:22 PM

These guys list one. I haven't used them, so I don't have any feedback.

http://www.heartthrobexhaust.com/4159M.html

best view · 10-04-2021, 08:31 PM

Just put the lmc system on fit good

60case · 10-05-2021, 08:56 AM

I used the heartthrob kit fit good nice rumble

**lks dcvn** · 10-05-2021, 03:24 PM

- used the kit on more than 1 Blazer over the years.

hemi43 · 10-05-2021, 04:51 PM

I made my own dual exhaust using off-the-shelf 304 stainless 'J' bends and a couple lengths of 2 1/2" pipe. It was less than $500 if I recall.

**3757chevy** · 10-05-2021, 05:11 PM

Quote:

Originally Posted by truckster

These guys list one. I haven't used them, so I don't have any feedback.

http://www.heartthrobexhaust.com/4159M.html

I have used this set and I would use it again.

harrij4 · 11-22-2021, 05:42 PM

I think I'm either going to modify the Flowmaster myself (but with some Dynomax or Borla mufflers) or just have a shop with TIG capabilities do the fab with 304.

FWIW, I did a "test run" of the crossover with some cheap aluminized tubing, and wow does it make a difference. 2,500-3,500RPM torque is vastly improved. Daily driveability is night and day.

Here it is before I completed the weld-up.

**Blazerowner** · 12-04-2021, 03:14 AM

I just purchased the Holley kit. I called summit racing and they price matched the cost below.

https://www.speedwaymotors.com/Flowm...%20(Feb28_2020)

**Blazerowner** · 12-04-2021, 03:18 AM

I just noticed the price went up. I got it for $548 and free shipping.

10-04-2021, 03:34 PM	#1
harrij4 Registered User Join Date: Aug 2018 Location: Santa Barbara, CA Posts: 127	Anyone still making exhaust systems for 1st Gen K5's? In a usual "slippery slope" situation, what started as a project to add a crossover (H-Pipe) to my '72 K5 with a 350, has now become a project to replace the entire exhaust system in order to clean things up, relocate the exhaust exits, and tone down the overall exhaust note a bit. Now, the question - Does anyone still make kits for these things? The closest I could find is this Flowmaster kit for a K10. I'm assuming that should fit, but I'd rather have 304SS instead of 409SS. https://www.holley.com/products/exha...r/parts/817940 Otherwise I'm going to buy a bunch of tubing and mandrel bends and going the DIY route.

10-04-2021, 04:42 PM	#2
1970BannerBlazer Registered User Join Date: Jun 2021 Location: Seattle, WA Posts: 72	Re: Anyone still making exhaust systems for 1st Gen K5's? For the price of the Holley kits I would just have a shop custom make a system. Depending on where you live it should be around $1,000. Now if you have the skills to DIY, then I would go that route.

10-04-2021, 06:22 PM	#3
truckster Registered User Join Date: Jan 2001 Location: Orem, Utah Posts: 8,021	Re: Anyone still making exhaust systems for 1st Gen K5's? These guys list one. I haven't used them, so I don't have any feedback. http://www.heartthrobexhaust.com/4159M.html __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

10-04-2021, 08:31 PM	#4
best view Registered User Join Date: Apr 2009 Location: newbury new hampsire Posts: 2,177	Re: Anyone still making exhaust systems for 1st Gen K5's? Just put the lmc system on fit good

10-05-2021, 08:56 AM	#5
60case Registered User Join Date: Feb 2015 Location: friendship WI Posts: 174	Re: Anyone still making exhaust systems for 1st Gen K5's? I used the heartthrob kit fit good nice rumble

10-05-2021, 03:24 PM	#6
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,352	Re: Anyone still making exhaust systems for 1st Gen K5's? - used the kit on more than 1 Blazer over the years.

10-05-2021, 04:51 PM	#7
hemi43 Registered User Join Date: Mar 2015 Location: Ontario Canada Posts: 1,538	Re: Anyone still making exhaust systems for 1st Gen K5's? I made my own dual exhaust using off-the-shelf 304 stainless 'J' bends and a couple lengths of 2 1/2" pipe. It was less than $500 if I recall.

11-22-2021, 05:42 PM	#9
harrij4 Registered User Join Date: Aug 2018 Location: Santa Barbara, CA Posts: 127	Re: Anyone still making exhaust systems for 1st Gen K5's? I think I'm either going to modify the Flowmaster myself (but with some Dynomax or Borla mufflers) or just have a shop with TIG capabilities do the fab with 304. FWIW, I did a "test run" of the crossover with some cheap aluminized tubing, and wow does it make a difference. 2,500-3,500RPM torque is vastly improved. Daily driveability is night and day. Here it is before I completed the weld-up. Attached Images

12-04-2021, 03:14 AM	#10
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,968	Re: Anyone still making exhaust systems for 1st Gen K5's? I just purchased the Holley kit. I called summit racing and they price matched the cost below. https://www.speedwaymotors.com/Flowm...%20(Feb28_2020) __________________ Kirk 72 Blazer CST 4wd highlander

12-04-2021, 03:18 AM	#11
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,968	Re: Anyone still making exhaust systems for 1st Gen K5's? I just noticed the price went up. I got it for $548 and free shipping. __________________ Kirk 72 Blazer CST 4wd highlander

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