How much HP from Muffler?

[S.L.A.B]

Im going to get a super 40 flowmaster muffler for my 5.3 05 yukon. im going to dump it at the muffler(cuting off the pipes after the muffler). How much HP should i expect to get/if any idk.



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24in U2 55s,superchip,billet grille,LED interior lights,LED license plate lights,10000k HIDs, CAI(comes friday)

 

[Nortex]

1 or 2 hp, people do it for the sound thats about it

 

[07Burb]

X2 what nortex said. Very little hp gain (and sometimes loss) is had from muffler modding and stock motors...

 

[DaRosa218]

Sometimes because of loss in back pressure, you can lose some horsepower. I had a Super 40 Flowmaster docked in front of the axle on my '03 4.8L LS and I lost my bottom end torque but seemed more of a pull on the top end.

My '02 Z71 has a Magnaflow 3" in Dual 2.5" out the sides behind the tire and has great bottom end and top end

Both are rolled 3.5" Tips

 

[thehoe92]

no dyno tests or anything but I felt like I gained
I swapped out my stock for a Magnaflow Race series single in and single out with turn down before the axle
it was a lot quicker on low end and top end

 

[slocaddy]

100 hp to the wheels at least.

 

[Z-56 Hoe]

I have Dynatecks LT headers with free flow cats and a Cherry bomb extreme 3" single inlet and two 2-75" outlets dumped right at the axle. I have a full tune and a built engine too.

 

[brucebruce45]

Sometimes because of loss in back pressure, you can lose some horsepower. I had a Super 40 Flowmaster docked in front of the axle on my '03 4.8L LS and I lost my bottom end torque but seemed more of a pull on the top end.

My '02 Z71 has a Magnaflow 3" in Dual 2.5" out the sides behind the tire and has great bottom end and top end

Both are rolled 3.5" Tips

U dont need backpressure to make torque

 

[Huck]

if you paint your calipers red...and add a muffler...+80hp minimum.

 

[blueflamed03]

not to 'make' torque, but too much of a free flowing exhaust can hamper and take away low end power.