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Justin: Hi, everyone, Justin with Americanmuscle.com here with a Stage Two Power Pack Bolt Onbuild
up for the 2010 through 2012 GT500s. Now a lot of times gear heads will say boost is
an addiction. You get some and you just want more and more, and that's certainly the case
here with these GT500s. Given a few extra pounds of boost along with a quality tune
can really transform these cars into a completely different animal and that's what we're after
here today with our Power Pack. Now if you guys are looking for more power out of your
Mustang, whether it's a GT500, GT or V6, you need to click on the link below to subscribe
to our YouTube channel for more great Mustang videos including more Bolt-On Build-Ups. The
Stage Two Power Pack is no doubt a favorite with many GT500 owners and its for those of
you that have already taken care of the few of the basic Bolt Ons. Your cold air intakes
and tune for example. Just like a lot of other things in the forced induction world you can't
just crank up the boost and go without addressing other key areas of your ride to ensure your
getting the most out of your mods for one, but for more important reasons, to ensure
the safety of your motor. So with that said, let's check out some of the parts for this
Power Pack. Under the hood now your going to find a couple new parts, both from Metco
Motorsports that we just finished up installing in our 2012 GT500. The first one is the 2.6
inch pulley from Metco Motorsports. Now a supercharger pulley like this unit is always
a very popular choice with the GT500 owners out there, because it's going to spin that
stock heat and blower must fast, creating more boost. In this case, we should be looking
at three to four more pounds of additional boost when compared to the factory pulley.
Now besides spinning the blower faster creating more boost, we should also look for an increase
in that beautiful supercharger whine, that we all know and love. Especially with that
JLT intake in place. The Metco Pulley is actually a very nice piece and its actually highly
recommended with other GT500 owners here on the site. In fact, if you just want to click
on the link below you can catch up on some of the customer reviews. The design of the
pulley is actually a two piece design, meaning you have a hub that presses to the supercharger
shaft first and then the actual pulley part bolts to that hub using the included fasteners
here. This is just going to make any future pulley swaps a complete snap. If you ever
want to lower or increase your boost in a hurry. Now you want to make sure you have
a quality pulley removal tool, first before getting started removing the factory pulley
and installing the new Metco unit here. It's just going to make life a whole lot easier,
trust me. And again, you can't just bolt up a smaller pulley, and go. For one, doing so
will create slack in the factory serpentine belt which is never a good thing. What happens
is, the factory tensioner system can't make up the difference caused by running the smaller
pulley which is going to lead to dreaded belt slip, robbing your GT500 of not only boost
but also power. That leads me to the second part of our Power Pack here. The Metco Motor
Sports auxiliary idler pulley kit. Now the job of a kit like this is to take up all that
extra slack created by the Metco Motorsports 2.6 inch pulley, creating much more belt wrap
and preventing belt slippage. This way the boost level should stay rock solid even through
the upper RPM range. On top of that, the double bearing construction with the idler, is going
to be a little bit more durable, maybe a little more quieter than the single bearing unit
and for only a few bucks more it really is worth it in my opinion. Alright, with the
Metco idler in place to do its thing, of course with the smaller pulley in place to spin that
blower up much faster, we will be seeing more boost. Meaning we had to address our spark
plugs. So we installed the NGK TR6 plugs which really, are the go-to spark plug for any Shelby
owner who is upping their boost. They're a one heat range colder plug compared to our
stock plugs which will help avoid any possible detonation. An import note, just make sure
they're gapped correctly before install to avoid any spark blow-out. Definitely recommend
doing something like this whenever you start increasing the boost levels in your GT500,
like we are here with our 2012. Alright, with our Stage Two Power Pack in place, I got my
good buddy Mike Johnson, from the Bama Performance team, to write us a new tune for our 2012
with the increased boost levels. Now Mike, explain to these guys at home, how the few
extra pounds of boost are going to effect things on your end? Mike: Well with the higher
boost levels in place we've already gone in and made some adjustments to our timing tables
so you won't see any detonation, and just in case, our colder plugs are also going to
help with that as well. And then it's going in and looking at our fuel and spark tables,
to make sure our air/fuel ratio is right. You won't have any problems there. Justin:
Well looks like your out of the car so I assume your all wrapped up. Mike: Absolutely, she's
all yours. Justin: Cool man, I'm a hop in, let a rip. At the end of the stage one Power
Pack our 2012 GT500 was putting down 523 horsepower, and 497 pound feet of torque at the rear wheels.
With the Stage Two Power Pack installed, the car is now making 532 horsepower, and 523
pound feet of torque. Giving us a peak gain of nine horsepower over our stage one numbers
and gains of 32 horsepower and 36 pound feet of torque throughout the curve. The Stage
Two Power Pack consisting of the upper pulling supporting mods is always a big hit with GT500
owners out there, and I think it's pretty easy to see why. *** for the buck, there's
really nothing like swapping out that upper pulley and cranking up the boost on your Shelby.
That's going to wrap up the Stage Two Power Pack Bolt On build up for the 2010 through
2012 GT500's. Don't forget to check out the Stage One and Three Power Packs and remember,
for all your Mustang needs, keep it right here at Americanmuscle.com.