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Old 09-26-2015, 07:47 AM   #1
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max HP for stock catback with catless X

At what point does it become a significant restriction?
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Old 09-30-2015, 10:54 AM   #2
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Something you will never have to worry about with a stock motor.
Chances are something 80% of people will never have to worry about.


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Old 09-30-2015, 11:59 AM   #3
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Something you will never have to worry about with a stock motor.
Chances are something 80% of people will never have to worry about.


🍼and 🌽 fed coyote.
At some point beyond my warrantee (was going to keep it stock with an extended warrantee, but just bought a new fusion, so that will be my warrantee car, I just need one ), am considering an On3 Twin. Have no desire to change catback, unless I'd loss 50 HP from not changing it.

I am willing to lose some HP (or turn up the boost a bit to get it back) to keep it as close to stock quiet as possible. I'd be happy with 550 WHP through an auto if that helps.
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Old 09-30-2015, 12:40 PM   #4
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More than fine with 550hp.



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Old 09-30-2015, 06:46 PM   #5
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More than fine with 550hp.



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Thanks!!!!!!!!!!!
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Old 10-01-2015, 02:03 AM   #6
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With a On3 turbo setup you should be making more than 550whp easy
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Old 10-01-2015, 05:07 AM   #7
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With a On3 turbo setup you should be making more than 550whp easy
I'd probably crank it up for some track runs, but even 500+ WHP on the street is usually pretty useless for traction.

I was just curious what the stock exh could handle, as unlike most, I think it has the perfect amount of "throat" for daily use. Stealth is GOOD!!!!!!
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14 GT-Roush Phs 3, VMP 93 tune, Whiteline Sway Bars, Roush U/L Rear Control Arms, 18 X 9/10 Bullits with 295/255 NT05's
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Old 10-01-2015, 09:35 AM   #8
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Turbo 4 cylinders put 550 through a single 3". Do the math, you essentially have 2, 2.5L 4 cylinders attempting to put 225 whp through a 2.75" exhaust at that point. Not even close to stressed.
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Old 10-03-2015, 06:39 AM   #9
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Turbo 4 cylinders put 550 through a single 3". Do the math, you essentially have 2, 2.5L 4 cylinders attempting to put 225 whp through a 2.75" exhaust at that point. Not even close to stressed.
True, but I had not measured my stock exh size and even then, mufflers can be very restrictive on stock vehicles sometimes, even if the exh if properly sized.

My goal would be 10.90's (track only, would turn down the boost to whatever was needed to make it "drivable" on a sticky 295 street tire) with the only on3 twins, on3 catless X, and proper tire.
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