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Old 07-13-2012, 10:32 PM   #41
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Interesting. I never got that deep into building my last Focus. I knew where I wanted my powerband and added components based where they improved that area. I eventually wound up with a car that had incredible top end because of the mix and match that I did. And by incredible I mean vs. how it was stock.
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Old 07-14-2012, 10:59 AM   #42
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Quote:
Originally Posted by dyn085 View Post
Bernoulli's Priciple will give you some insight. An engine is just an oversized air pump...it's not that there's more air flow, just that the velocity changes. Temperature, pressure, and velocity go hand in hand. Your header was smaller piping and was high temp, so velocity was high. In the 2.5", it had more room and time to cool, so velocity slowed. You can only flow out the same amount that flows in.

There's so much more to it, but thats a quick overview.
This decrease in velocity will slow the gasses from exiting the exhaust , which should cause pressure to increase slightly.
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Old 07-14-2012, 11:32 AM   #43
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Quote:
Originally Posted by Brabs_Weather View Post
This decrease in velocity will slow the gasses from exiting the exhaust , which should cause pressure to increase slightly.
This is also true, which is good for torque. Notice the difference between Red and Focusboys dyno charts. While there are many contributing factors, the header makes a huge difference in the torque curve. Or, in Focusboy's case the lack thereof. His table-top torque curve should represent an increased driveability.
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Old 07-25-2012, 04:44 PM   #44
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Originally Posted by rick47 View Post
I do like you on mine, it's a dual Camaro muffler ... sound loader, just ok
I had though about doing this with a comaro/firebird 80 series Flowmaster, but with larger 3.5" black tips (dont judge me, my F150 has 5in tips)

Which muffler is this and how does is sound on the 4? Im looking for deep, I want to go with a 2.5" catback exhaust with a compast hich flow cat behind an FS werks header.
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Old 07-25-2012, 05:10 PM   #45
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Originally Posted by 2012Tuxedo View Post
I had though about doing this with a comaro/firebird 80 series Flowmaster, but with larger 3.5" black tips (dont judge me, my F150 has 5in tips)

Which muffler is this and how does is sound on the 4? Im looking for deep, I want to go with a 2.5" catback exhaust with a compast hich flow cat behind an FS werks header.
I was looking into something similar. My plan would be race header, FSwerks stealth, with lunchbox that has dual output. I'm not sure how much it would quite the stealth exhaust with an extra muffler added in.
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2001 ZX3 CD Silver MT: Fastest time 0-60ft 2.1, 15.5 q/mile, 87.1 mph.
Purchased 6/14/01 with 7 miles - Traded in 6/25/12 with 122,355.

2012 SE Sport 5dr Ingot Silver MT:
Purchased 6/25/12 with 30 miles.
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