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Old 10-30-2014, 10:09 PM   #246
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I don't have the x pipe. I was toying with the idea of leaving the cats and having them cut out to 2.75 inches and then run into a custom xpipe followed by dual resonator mufflers. Not sure if it would have any gains but the stock resonators and x pipe look restrictive.

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2.75 is going to be too big. 2.5 would be good. For the most part, that's my current set up. Catless 2.5" x pipe with a 2.5" catback, which amounts to straight pipes with "mufflers" (resonators) after the mid pipe.

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Old 10-30-2014, 10:35 PM   #247
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You kept your cats?

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Old 10-30-2014, 10:39 PM   #248
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You kept your cats?

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Nope. I meant a similar set up except for the cats.

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Old 10-30-2014, 10:48 PM   #249
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Did you get goid gains ditching the cats

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Old 10-30-2014, 10:51 PM   #250
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Did you get goid gains ditching the cats

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Initially I had the high flow catted BBK x pipe then I switched to catless.

I felt minor gains on the butt dyno. Nothing crazy, but there's definitely more there. Mostly did it to get rid of the damn O2 sensor headaches lol

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Old 11-03-2014, 02:24 PM   #251
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Took some measurements today and I'm not so sure about this now. My IM opening is 74.6125mm. The GT TB rear opening is 80.9625mm. The inner gasket diameter is 82.55mm. That only leaves 0.79mm from the gasket inner edge to the TB inner edge. Not sure how I feel about that.

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Old 11-03-2014, 02:31 PM   #252
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Took some measurements today and I'm not so sure about this now. My IM opening is 74.6125mm. The GT TB rear opening is 80.9625mm. The inner gasket diameter is 82.55mm. That only leaves 0.79mm from the gasket inner edge to the TB inner edge. Not sure how I feel about that.

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Did you measure including the interior fins? If so, those will be removed during the installation.

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Old 11-03-2014, 02:48 PM   #253
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Did you measure including the interior fins? If so, those will be removed during the installation.

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The 74.6125mm is the IM opening excluding the fins. Had I included the fins, it would have been way smaller.

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Old 11-03-2014, 02:55 PM   #254
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Mine is 78 them 80mm with fins and sanded
What year is your car? Maybe 5 hey are different for 11-12 mustangs and it was one of the changes for 13-14 model years.

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Old 11-03-2014, 03:09 PM   #255
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Mine is a 2012.

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Old 11-03-2014, 03:10 PM   #256
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Makes me curious

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Old 11-03-2014, 04:36 PM   #257
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My ported intake manifold (no fins, ported, sanded, etc.) is 76.2mm opening.
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Old 11-03-2014, 04:38 PM   #258
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I'll try to measure mine as well. I have a '12
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Old 11-03-2014, 04:40 PM   #259
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Guess I ported mine a little more

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Old 11-03-2014, 04:56 PM   #260
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Guess I ported mine a little more

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What diameter is yours?

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Old 11-03-2014, 04:58 PM   #261
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I'm 79.57

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---------- Post added at 04:58 PM ---------- Previous post was at 04:58 PM ----------

It's very close to being the edge of the seal and all.

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Old 11-04-2014, 04:39 AM   #262
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And for anyone wondering, here are some pics of the IM opening and TB comparison.

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Old 11-04-2014, 04:41 AM   #263
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I also noticed the GT TB opens in the opposite direction. Just an observation.

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Old 11-04-2014, 05:53 AM   #264
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I ground mine down to nearly the green gasket. That makes it match perfectly.

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Old 11-04-2014, 08:52 AM   #265
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And for anyone wondering, here are some pics of the IM opening and TB comparison.

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How about how the holes match up from the V6 TB to the GT TB
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Old 11-04-2014, 03:14 PM   #266
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How about how the holes match up from the V6 TB to the GT TB
Had to put it back together. It's my DD.

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Old 11-05-2014, 07:08 AM   #267
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So any results from the updated tunes for this? I haven't gotten my tune sent back to me yet with the adjustments made from my data logs.

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Old 11-05-2014, 11:14 AM   #268
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I sent my datalogs to mpt. Ken told me there wasn't anything in them that warranted a change.. not cool!

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Old 11-05-2014, 12:50 PM   #269
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maybe your "no-tune" required Airraid is not allowing for the added air flow...remember its a no tune so it doesn't add diameter where the MAF sensor sits. Its the same as stock so it bottle necks the incoming air a bit. The real power feel your getting is from the filter it uses and the open element for the top end increase but thats really it.
14mustang i think your will come out to being just a bit better cause you have a Steeda intake correct?
Whats the diameter of the Steeda vs the Airiad? 3" vs 4"?
I have an unmarked Injen intake. Its about 3"-3.25" in diameter but the section where the MAF sensor sits is the same as the stock housing size...Im going to cut it shorter on both ends to eliminate the bottle neck a little so it will flow more evenly. straight from filter to MAF sensor and graduly increase diameter to the TB
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Old 11-05-2014, 12:53 PM   #270
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True. It has a bigger maf and my tube is bigger so the whole path is 80mm. I will try to data log when I get my new tune all broken in and post the numbers

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Old 11-05-2014, 12:55 PM   #271
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what are your current Virtual Dyno numbers?
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Old 11-05-2014, 01:20 PM   #272
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I think I was at about 287 and 274. I ran a few pulls and they varied a little. I used intake air temperature as well since that's what is being ingested by the engine rather than using just air temp. It's more accurate because the air going into the manifold is not the same as the outside air temp.

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---------- Post added at 01:20 PM ---------- Previous post was at 01:19 PM ----------

I believe the steeda velocity stack is 4"

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Old 11-05-2014, 01:28 PM   #273
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thats the same as the GT intakes ya?
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Old 11-05-2014, 01:29 PM   #274
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I think so.

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Old 11-05-2014, 01:33 PM   #275
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Isn't that a bit overkill? Does a 3.7 L engine need an intake the same size as a 5.0L?
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Old 11-05-2014, 01:36 PM   #276
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I just ordered the intake and then made it all the same size into the intake manifold

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Old 11-10-2014, 01:19 PM   #277
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I was going to start a new thread but I figured i would just post in this one since everyone who has been responding to this seams more friendly toward fabricating GT parts for the 3.7

A lot seam to agree that the 3.7 cats are the biggest choke point on the car correct?
Now not all cars have this kind of restriction within their CATs. Most are the exhaust which is why we go for Cat-backs and so on.
I know a bunch of us want to keep our cats because we want to remain legal in our respected states or towns, but what if there was a way that wasnt HIGH FLOW cats (we know they dont pass SMOG in Ca primarily due to the way they look but they also dont pass the sniffer test).

My question is what if we fit GT cats into our exhausts?
They are larger yes but as we know you can fit a GT H pipe replacing the 3.7 mid pipe with little modification. Just a simple bit of cut and weld. Are the GT cats any different than ours? (I would think because that is a BIG engine they are working for). It might just be what we need to free up the exhaust but also remain legal?

This is a big BIG theory I just thought up (others may have as well) but thought it was worth the time to ask, maybe gather ideas from you lot and see if there is more to it than Im thinking.
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Old 11-10-2014, 01:25 PM   #278
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The law says if you remove the factory catalytic converters and replace them with non oem for that car due to failure only, it's illegal. Even if its Ford, even if it's a Mustang, it's not stock.

That said, are they different? Very likely. Will they be less restrictive? Also likely, but you won't be legal technically.

If you get pulled over I doubt they're going to pull part numbers and check, but if you get a fix it ticket where you get sent to inspection, they'll find out.

The glory of not being in an inspection/smog state. I'm certainly not legal, but no one cares.

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Old 11-10-2014, 01:33 PM   #279
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True but those who intend to keep their cats are most likley not doing stupid **** to get pulled over so much as someone who say "fug it" and removes their cats. I guess the only way to tell is to have someone mock up some GT cats to be removable and take it to a SMOG place to see if it passes...but its worth a shot i think. Cause if your in Pa, Ct, Ma, Mi, Vt or any state who doesnt do sniffer tests you should be good.
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Old 11-10-2014, 01:41 PM   #280
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hmmm 2 things:
1. The flanges are different so it would either be very difficult, or very costly to get them to bolt to the factory 3.7 headers.

2. Due to the difference in angle from the motors, aside from the needed work above, if the cats were incorporated, the entire mid pipe would need to be adjusted, which could add up quick.

Also, what determines the flow rate of the cat is the number of cells it has, more cells = better filter = less flow. I would bet the GT and V6 have a similar number of cells, so basically the flow restriction would just come from the fact that the GT cats are slightly larger in size?
Also, since the GT has 1 more cylinder per bank, it is possible there are MORE cells per cat on the GT to filter the extra emissions.
All in all i believe it is a sound idea in theory, just fails as far as application is concerned. Again though, i am mostly shooting from the hip here.
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