Shows it adds 9rwhp 7rwtq

 

Something about that doesn't seem right

 

Doubtful

 

I don't believe axlebacks add any power, or maybe just a hint of power. However, my '11 5.0L has just a canned SCT 91 octane tune, GT500 axlebacks, and a K&N air filter (stock airbox) and put down 409 rwhp / 382 rwtq on a stingy Mustang Dyno a couple of weeks ago.

 

How is that possible? Could it have anything to do with less weight?

 

more air flow coming out of the exhaust? Since there maybe less back pressure

 

Come again?


That is **** impressive.

 

Dunno if they add power - but I bolted mine on just yesterday - and they definitely made my day with the new sound.

 

The only way they could alter the power output is by altering the flow of exhaust, i. e., reducing back pressure. One of the recent videos on Carroll Shelby on the velocity channel talked about the designers going through dozens of exhaust configurations just to get the sound right. It's easy to reduce back pressure, more difficult to produce just the right exhaust note. They're for sound, not increasing performance.

 

Strictly for sound thats it.

 

My car gained 100 hp with the GT500's.

 

Is that at the wheels??? lol

 

5.0L's with the manual transmission usually put down around 365 rwhp stock. SCT claims their canned 91 octane tune is good for 34 rwhp, so that should have brought me up to about 399 rwhp. Beyond that, I only have a K&N drop-in filter inside my factory airbox and the GT500 axlebacks and I'm at 409 rwhp on a Mustang Dyno. So, that air filter and the axlebacks together are worth about 10 rwhp if my math is right, but I don't have the cash to go back to the dyno to test them individually to see which is which. This combo has been good enough to see a 117.17 trap speed in the 1/4 mile a couple weeks ago, so I know the dyno # makes sense.

 

Hey jellowood, don't forget to put the date of your first fill up when you get it.

 

Wait a minute!!!! Werent you the guy blowing on a fella last week for wanting to put the super snake body kit on his 5.0 minus the emblems and you put gt500 mufflers on your 5.0? In that case 5.0 with gt500 mufflers= super fake shelby!! Dude your a moron!!!

 

For you, I'll even put down the gallons and dollar amount! lol

 

I have also heard that the GT500s are worth about 4-5hp and also that the K&N about the same, so to me your numbers 'add up'. I will have both of those on my Mustang so we'll see what numbers I get if I ever end up with it on a dyno.

 

I agree. I'm sure its adds a couple being less restrictive.

 

Yeah, that front end

 

Wow dude you have some serious issues. The mufflers are made by Ford Racing for the 5.0 Mustang. Look in the mirror before you call me a moron.