dual exhaust kit

mjck5 · May 17, 2024

was curious if anyone out there has installed a Dynomax Header-Back Dual Exhaust Kits 89005 on a k5 blazer, if so id love to see some pics of how the final product looks

TDoc · Mar 18, 2025

I just ordered the 89004 kit which is a header back universal kit for squarebody truck and suv. I’m going to try and adapt it to my manifolds. If that doesn’t work I’ll order headers but would rather stick with manifolds.

Summit sells the Dynomax 89004 kit for $173

Dynomax Performance 89004 Dynomax Header-Back Dual Exhaust Kits | Summit Racing

Free Shipping - Dynomax Header-Back Dual Exhaust Kits with qualifying orders of $109. Shop Exhaust Systems at Summit Racing.

www.summitracing.com

Walker / Dynomax makes a manifold kit but it’s more $$$.

You need to supply your own mufflers so I added these stainless 409 magnaflow knockoffs. $44 ea

AP Exhaust XS1255 AP Exhaust Xlerator Performance Mufflers | Summit Racing

Free Shipping - AP Exhaust Xlerator Performance Mufflers with qualifying orders of $109. Shop Mufflers at Summit Racing.

www.summitracing.com

I’ll add pics once I get it installed in a few weeks.

TDoc · Mar 18, 2025

Here’s my ‘86 k5 305 w stock 4bbl quadrajet, 700R4. Still rocking the stock exhaust which is super thin in spots and the y pipe is beat up by the front driveshaft. Which is why I’m switching to dual exhaust. I’m not expecting a power increase, but would be nice. The catalytic converter was already removed before I purchased, and there are no emissions requirements in my area

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TDoc · Mar 24, 2025

A good amount of cutting and welding to make the 89004 header kit work with stock manifolds. Reused stock manifold down pipe and adapted exhaust kit to weld up to it. I was going to do headers but decided to leave the manifolds. The bends in the Dynomax kit are good to clearance around the transfer case and looks even coming out the rear passenger and driver side. The ol 305 has a little more getup and go, mostly noticeable in the higher revs. It used to shift smooth and soft at wide open throttle. Now it has a firmer shift. Maybe +5-10 hp. I have some videos of the exhaust sound and a walk around of the k5 on my YouTube channel.

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dual exhaust kit

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Dynomax Performance 89004 Dynomax Header-Back Dual Exhaust Kits | Summit Racing

AP Exhaust XS1255 AP Exhaust Xlerator Performance Mufflers | Summit Racing

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