Best exhaust setup for performance

[90K1/2ton]

Looking to completely replace the stock exhaust on my pickup this upcoming spring. No sure what route to go. Long tubes with 1 5/8" primarys /3" collectors seem to be what almost everyone suggests. Are true duals (3") or a y pipe/single outlet (3") the way to go? Engine will eventually be rebuilt with a goal of 1hp/ci and 400+ftlb of torque. Will be switching to 4bbl and possibly nv4500.


1990 K1500
LO5 350
Getrag 5 speed
3.73 posi rear
167,*** miles.

Thanks,

Eric

 

[polar]

Your not making enough power for true dual 3". Go 2.5" duals an you will be fine


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[polar]

Even with the built engine, dual 3" is a lot of exhaust


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[SCOTTYINWV]

Dual 2 1/4 or a single 3" is plenty for a mild sbc. I wouldn't run dual 3" on anything that wasn't running forced induction. Dual 2.5 can be overkill in some situations.

 

[polar]

With that engine he said he was building would be on the edge of dual 2.5. Now that I look at it again, I thought it said 400+ hp, which is why I said dual 2.5.
But with 1hp per c.i. I would do dual 2.25 like stated above


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[SCOTTYINWV]

With that engine he said he was building would be on the edge of dual 2.5. Now that I look at it again, I thought it said 400+ hp, which is why I said dual 2.5.
But with 1hp per c.i. I would do dual 2.25 like stated above


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I would bet I have a descent power loss from the po running dual 2.5 on mine...

 

[polar]

You probably do. 400hp in my opinion the mark when 2.5" duals can work out. When you hit 500hp you start thinkig about 3" duals. But 3" duals are good from 500hp-800hp


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[SCOTTYINWV]

You probably do. 400hp in my opinion the mark when 2.5" duals can work out. When you hit 500hp you start thinkig about 3" duals. But 3" duals are good from 500hp-800hp


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I'm thinking about dropping to a single 3" muffler and then a 2.25 or 2.5 y. I would be okay there, but 2.5 off of each manifold is a little bit big on mine...

 

[polar]

Probably would be a good idea


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[SCOTTYINWV]

Probably would be a good idea


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Sinle 3" high flow cat and 3" dynomax ultraflow race muffler