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Old 10-04-2021, 03:34 PM   #1
harrij4
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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.
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Old 10-04-2021, 04:42 PM   #2
1970BannerBlazer
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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.
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Old 10-04-2021, 06:22 PM   #3
truckster
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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
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Old 10-04-2021, 08:31 PM   #4
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Re: Anyone still making exhaust systems for 1st Gen K5's?

Just put the lmc system on fit good
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Old 10-05-2021, 08:56 AM   #5
60case
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Re: Anyone still making exhaust systems for 1st Gen K5's?

I used the heartthrob kit fit good nice rumble
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Old 10-05-2021, 03:24 PM   #6
lks dcvn
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Re: Anyone still making exhaust systems for 1st Gen K5's?

- used the kit on more than 1 Blazer over the years.
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Old 10-05-2021, 04:51 PM   #7
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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.
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Old 10-05-2021, 05:11 PM   #8
3757chevy
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Re: Anyone still making exhaust systems for 1st Gen K5's?

Quote:
Originally Posted by truckster View Post
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.
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Old 11-22-2021, 05:42 PM   #9
harrij4
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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.
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Old 12-04-2021, 03:14 AM   #10
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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)
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Old 12-04-2021, 03:18 AM   #11
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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.
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