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Old 03-21-2008, 06:59 PM   #1
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New Exhaust Setup-CFM HFC and Lunch Box Delete-Pics and Vid

Today I got my CFM hi flo cat installed and did the lunch box delete mod

here are the pics











The tip is 2.5" but it looks a lot smaller than I imagined it would so its kind of awkward looking, but i'll get used to it

The car is really loud between 1600-2800 RPMS, other than that i didn't notice much of a sound difference except that it's more raspy


As far as the HFC power gains, its not really a kick in the pants, but it does pull a bit harder in 1st and 2nd, and noticeably more in 3rd


VID LINK: http://www.youtube.com/watch?v=MseIYfHI0eg


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Last edited by Jonnerboy; 03-22-2008 at 02:13 PM.
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Old 03-21-2008, 07:13 PM   #2
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As far as the HFC power gains, its not really a kick in the pants, but it does pull a bit harder in 1st and 2nd, and noticeably more in 3rd
I don't know what this is supposed to mean. Obviously gear selection does not change power output. How does the car pull relative to rpm? Any soft spots? Any better at some particular higher rpm range? Gain or loss at lower revs? etc etc etc

I think I'll skip the "lunch box delete"...rather "flatulent" sounding in my opinion.
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Old 03-21-2008, 07:19 PM   #3
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i think what he is trying to say is that it is more noticeable in the first three gears.
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Old 03-21-2008, 07:23 PM   #4
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i think what he is trying to say is that it is more noticeable in the first three gears.

That's not what he wrote. Often the reality is that power gains are harder to notice in lower gears because you spend less time in them at full throttle, revving to redline or whatever, so it's more difficult to perceive small differences. Maybe he can offer more details about what he felt by the seat of the pants, relative to rpm of course.
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Old 03-21-2008, 07:33 PM   #5
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but it does pull a bit harder in 1st and 2nd, and noticeably more in 3rd




That is pretty much what he said. It pulls harder in the first three gears. And i dont know about you but i feel the difference more in the lower gears with a new bolt on than i do in 4th or 5th....
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Old 03-21-2008, 07:44 PM   #6
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i dont know about you but i feel the difference more in the lower gears with a new bolt on than i do in 4th or 5th....
My point is simple: When trying to sense small power gains, sometimes the brief amount of time you spend in a lower gear (especially 1st, with traction being a limitation sometimes) at any given rpm makes it a little harder to tell if there IS a difference. In higher gears, say 2nd or 3rd you spend more time at, say 6000-7200 and it's easier to tell if the flattens a little or continues to climb a bit after installing that theoretically deeper breathing K&N FIPK (for example).

Back to the high flow catalytic converter: I'm still curious to know where the engine pulls harder...high end, mid-high, everywhere, bottom end loss? etc etc More details are always appreciated. How else can we inform each other, hmm?
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Old 03-21-2008, 08:03 PM   #7
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i say get the factory tip put back on there, or get another tip to fill in the space

other than that, looks great
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Old 03-21-2008, 08:21 PM   #8
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Yeah, definately needs a bigger tip. But good work.
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Old 03-21-2008, 09:18 PM   #9
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I have a hard time believing you will feel any difference with that mod..JMO
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Old 03-21-2008, 09:45 PM   #10
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Ok to clear all this up I feel more power in the mid-high rpm range. Happy? And I'll look into a new tip in the near future





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I have a hard time believing you will feel any difference with that mod..JMO
Actually, if you would have seen the dyno conducted by tom or CFM(I don't remember) the high flow cat makes proven gains close to an ORP
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