Exhaust not as loud as it is supposed to be

Asked by Oct 10, 2017 at 08:50 PM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

I have an 88 silverado with a thi 350 in it.
It has flowmaster super 10s with no cats and 2 1/4
inch pipe but it is really quiet for the setup. I had a
92 with the same set up and it blew eardrums
going down the road. What is the issue?

6 Answers

107,435

Maybe the 92 had them on backwards.

No that definitely wasn't the issue, already checked on the 88 as well.

107,435

The 88 is a lower compression than the 92 so less bang out the exhaust, plus the 88 is not designed to run this stuff they call fuel, and it effect it more than the 92, but it effects the 92 also but not in the same way, if you can see if you can find some ethanol free, gas tractor fuel or high test ethanol free boat motor fuel, and put that in the tank and see if it makes a difference in the sound. You may also notice that the 92 shuts the injection off under full deceleration, and the 88 does not do it completely.

So how do I go about changing the compression? Heads? Pistons?

107,435

Yep, nice set of heads, possibly forged pistons, a nice high lift cam, but you can't change the duration and have computer controls, maybe a cam gear drive setup if you don't mind the whine they make, a good computer programmer like superchips or similar, just remember all this costs big time. Or you could just put on a set of short cherry bombs and be done with it.

I would put some glasspacks on it but I do t think you quite understand when I say this truck is quiet. It's deep but it's almost as of it has flowmaster 50 series with cats. I've had slot of old trucks with slot of loud exhaust setups. Never ran into anything like this

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