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Posted (edited)

I just installed a set of the 674-495 and 674-496 on my 2017 L83 motor, and they were thicker than factory GM manifolds that I pulled out. Much heavier. The exhaust ports looked smaller. Are these better, worse, equivalent to factory manifolds? I also installed all new Walker exhaust system including new y-pipe catalytic exhaust system. The truck sounds "throatier" at startup and seems overall just a touch louder (which I like!), not sure why as it's all supposed to be equivalent to OEM. There is no flapper on the Walker system. I do get V4 drone now. I also replaced the motor mounts with AFP mounts, which vibrates more at idle - like a schoolbus - but I don't mind that either. Anyhow, just wondering if anyone had any thoughts on the Dorman manifolds!

 

Cheers!

Edited by AFournier

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