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First Mil.Spec bolt-on HFC installed

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Old Feb 14, 2010, 08:53 PM
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First Mil.Spec bolt-on HFC installed

First off, I want to say thanks to Erik for his great customer service. He knew I had a deadline and did everything he could to make that deadline for me. Apparently I've just installed the first Mil.Spec Evo X 100 cell HFC.

What to say? Mil.Spec has a reputation for making the best high flow cat. It's 3" all the way, stainless steel, mandrel bends, the fit was perfect, and the cat is definitely high flow since I can see through the cells. For those of you worried about smell, I couldn't detect any smell from the exhaust. As far as numbers go, I'm scheduled for a tune tomorrow at GST.

orthojoe
2008 Evo X MR
Defi BF boost gauge
HKS bumper shields
Saiko Michi oil catch can
Harman Motive intake with AMS heat shield
T1R intercooler pipes
Buschur crossflow catback
ETS 3.5" intercooler
Mil.Spec 100 cell HFC
Cobb AP with GST tune pending

Last edited by orthojoe; Feb 14, 2010 at 09:04 PM.
Old Feb 14, 2010, 09:02 PM
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thats cool man!
Old Feb 14, 2010, 10:30 PM
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One was installed at Reese Tuning two weeks ago that I know of, but stilla sick little piece for the X
Old Feb 15, 2010, 12:40 AM
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Technically it's the 2nd Evo X unit, but it's the first pre-production version. The first was a prototype
Old Feb 15, 2010, 07:35 PM
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Well, the car made 291whp and 294wtq. Feels great. I'll post dyno sheet on the dyno forum
Old Feb 15, 2010, 07:59 PM
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Originally Posted by orthojoe
Well, the car made 291whp and 294wtq. Feels great. I'll post dyno sheet on the dyno forum
What were the gains from the HFC?
Old Feb 15, 2010, 08:22 PM
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Sorry, couldn't tell you. The baseline dyno was with all the bolt-ons, so we don't have a good before/after.
Old Feb 15, 2010, 08:22 PM
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Is that 291whp / 294wtq after the tune with your accessport? sounds kinda low with all of your mods, no? mustang dyno?
Old Feb 15, 2010, 08:56 PM
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mustang dyno
yeah, i was hoping for more, but I guess this is a reasonable number for an MR on California 91 octane
https://www.evolutionm.net/forums/ev...hp-294wtq.html
Old Feb 15, 2010, 09:02 PM
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Was there a big differance in the sound when you switched from the stock cat to the mil spec high flow cat?
Old Feb 15, 2010, 09:06 PM
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maybe 'slightly' more raspy, but not noticeable unless you're really looking for it. The buschur exhaust does a good job of keeping things quiet. No droning on the highway. Sounds almost like stock when you're cruising.
Old Feb 17, 2010, 03:35 PM
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Originally Posted by Erik@MIL.SPEC
Technically it's the 2nd Evo X unit, but it's the first pre-production version. The first was a prototype
Well, TECHNICALLY... j/k

I've been running the Mil.Spec 100-cell (custom cat pipe) for about 5-6 weeks and I'm happy with it. Butt dyno noticed a slight drop in power over the testpipe, but definitely one of the highest flowing cats you can find. It still smells, but is a big improvement over running cat-less and should get better as I work on my tune.

And a big for Erik's customer service.
Old Feb 17, 2010, 03:56 PM
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I think we need to get a definition of "smells" here LOL

Does it filter like an OEM cat? No. But we use high-quality PGM coatings...your car should smell NOTHING like raw exhaust when running our cats

Just ask anyone that has to tune these cars in a cramped dyno room. You won't walk out of there with red, watering eyes like you will with a test pipe
Old Feb 17, 2010, 10:03 PM
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I've been running the Mil.Spec for 6 months and didn't notice any difference in smell from the stock cat on 91oct. I do notice more of a smell on E85 but it smell doesn't bother me.
Old Feb 17, 2010, 10:07 PM
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sweeet..are you using teflon hosing?


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