Horsepower difference in cated exhaust and offload exhast

[94gtbrandon]

Ok have 94 gt stock first thing I was going to do was exhaust since it doesn't have exhaust retard had it before thought it would sound cool without it I got bbk unequal length headers now debating on weather I should keep cats or off road x pipe does anybody have any dyno results with and without cats

 

[Slykin]

I don't have any dyno sheets or whatnot... but I wouldn't expect anything more than a 5hp difference AT MOST. The biggest bottleneck in our cars is the heads. The difference between catted and offroad is pretty small. I just run an O/R because it sounds better.

 

[D3VST8R96GT]

Depends on which/how many sticker(s) come in the box

 

[Snakebitten96]

Depends on which/how many sticker(s) come in the box

This made me LOL

tappin and talkin

 

[chrisv_10]

No real difference in HP just sound.

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[chrisv_10]

And catted xpipe cost more

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[KillNThrill24]

To be completely honest I suffered a slight accelleration loss when I pulled my cats off. I think it has something to do with the backpressure helping the lower end torque. But didn't stop me from leaving them off. The sound alone makes catless 100% worth it. If you want your Mustang to sound like a Mustang should, go catless. That's just my .02

 

[330CubeGt]

Just a few horse ponys...Not a big enough diff to worry about. Half the guys out there buy exhaust for the sound not the horsepower anyways

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[CC'S95GT]

I'm running Pypes violator mufflers and they're a flow through design. I say that first because I've ran an o/r H and a catted H and X (Emission testing in Ga.)
With the o/r H I also felt a little loss in torque in the butt dyno.
As for sound. It was LOUD. Really LOUD. At WOT my car could be heard a mile away, and it didn't sound that good either. Very blatty.
The catted X I'm running now quiets it down enough to sound still like a Mustang and not be rediculously loud.

 

[joekd]

Yeah you will see little if any difference. In the past I ran a off road H but went with a catted X on my current car simply because I don't want to have to swap out my midpipe every 2 years when my annual emissions check is due.

 

[CC'S95GT]

emissions in Ga is every frigging year.. I did swap it out every year for a couple years and just got tired of it.