Muffler upgrade

[chris989]

Hello All,

I wanted to share my experience. I would have never believed the difference if someone just told me.

My build is simple. 350 tbi with a small lunati cam
.437"/.454"
207/213 @ .050
250/256
header, 2.5-3" exhaust, stock chip.
https://67-72chevytrucks.com/vboard/...d.php?t=696544

I have been running a 3" high flow cat and a 3 inch turbo muffler (necks down to 2.25 inside) and at 3500 rpms it didn't have a lot of pull left.



I always thought it was the cam or heads causing this. My state lifted the smog requirements so i finally tried a new set up. My motor pulls easily to 4500 rpm now before the TQ falls off. It is night and day different. If I had not driven it both ways i would not have believed it.

The new set up is a glass pack along with a Jones Max Flow.
https://www.summitracing.com/parts/JEX-MF2289



Anyway,, before this I was thinking about a set of heads or a 406 dart block for more stroke. I am glad I didn't. I am excited to see if my mileage increases on my next camp trip while towing.

Chris