Another Cat-back system claiming 30+ HP increase??

[timfoster405]

The Gibson exhaust video came out with a claimed 30+ hp increase a few weeks ago and we all were like... "Yea... right..." switch to a cat-back never gets you that much HP increase... especially with the recent years... '11 to '14.

We were all asking the question was there a tune change mixed in???

Then magna-flow comes out with their supposed back to back HP dyno run and they are saying 30+ HP increase by simply switching to their comp system. see this:

https://www.youtube.com/watch?v=5R1wlGKJNkI

So, is there something to be had here? I have seen one 100% stock dyno run from American Muscle and they got 370 rwhp peak... then Latemodelrestoration put a a gibson cat-back and did a dyno run with just the exhaust and they show 390 rwhp as the peak. see this...

https://www.youtube.com/watch?v=ur2KAONHG5A

So... maybe this new car is corked up at the mufflers? American Muscle ran a 100% stock 6 sp manual and got 13.10...my '13 auto 100% stock runs 12.80 in 70 degrees temps...

I wonder if we are going to see the '15 car really get 20 to 30 rwhp from a cat-back change? if this is the case... good for us...because having a '15 not break into the 12's stock in stock trim really sucks...when the '11-'14's did it all day long.

I am having second thoughts on my '15 (due to be here on Nov 5)...since my '13, with just a Ford Motorsport tune, runs consistent 12.70's at 112 on factory radials...

 

[07TGGT]

They do run 12's stock...

 

[REDS197]

They have already been 12.80!

 

[timfoster405]

Ok... I checked the latemodelrestoration back to back runs and they got stock 375 and 391 with the cat-back...

If the runs can be considered equal... 16 rwhp and 19 hp at the crank.

I don't recall the '11 to '14's getting these numbers with a cat-back swap... somebody help me out...is that correct?

 

[Department Of Boost]

Our 15' is real quiet. It may be corked up.

 

[Johnf78]

It looks it when you look under there.

 

[fdjizm]

Didn't they add more cats?

 

[Department Of Boost]

Didn't they add more cats?

There is a huge box type muffler mounted half way down the car. Plus the mufflers at the back. There is a LOT of muffler.

Sorry so big, it was all I could find.

 

[timfoster405]

That huge muffler thing must be the reason. Listening to the videos of the car in stock trim, it appeared to sound louder than my '13 GT. Someone else on here already said the '15 is stone quiet...??? not sure...but the after market cat-backs do seem to be adding significant power than years past.

 

[BMR Tech]

This car is choked up on the intake and exhaust side.

CAI, Catback and a Tune, and these things will fly.