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Unread 06-27-2013   #1 (permalink)
JayyGT is offline Rookie


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Exclamation Horsepower for my build?

Looking to add anything else to my build to add some semi-easy horsepower and not to break the wallet.

1996 Mustang GT 4.6l 5-Speed

Current setup:
BBK throttle 78mm throttle body
BBK cold air intake
BBK short throw shifter
Hotchikis shocks all around
Adjustable camber plates
BBK off-road H pipe
Flowmaster 40 series exhaust setup
Aluminum Drive Shaft

Recently re-did the whole clutch system, motor mounts, waterpump/thermo, radiator and hoses, plugs and wires.
Sitting on Nitto street radials

A Tune was done a while back but since have added parts.
*I plan on buying BBK Shorty headers within the next few weeks*

Any suggestions?
Thanks,
Jay (A new member!)
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Unread 06-27-2013   #2 (permalink)
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PI head swap...look on Ebay for great prices
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Unread 06-27-2013   #3 (permalink)
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Livernois makes an adapter kit that fits the PI intake onto the NPI heads with zero fitment issues. You can keep the strut tower bar and everything.

1996-1998 4.6L PI Intake Adapter Kit - Livernois Motorsports

Considering that 95% of the additional airflow provided by a PI swap is in the manifold, valves and cams, $500 for this manifold is a bargain. You'll net 25-35 HP from this intake swap alone.

Also, PI heads kill the PTV clearance, making your choice of cams VERY limited, when installed on an NPI shortblock.

Stock NPI heads provide slightly more flow vs PI heads above .450 lift. Fully ported NPI vs fully ported PI, the NPI heads have better average flow, but marginally less high-lift(.450+) flow.

Rule of thumb is to make the head flow as much CFM as possible with the smallest port cross-section possible. The NPI head is clearly the winner in that regard.

The compression bump of the PI heads on an NPI block is nice, but after you get done notching your pistons for PTV clearance, that bump will be mostly gone.
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Unread 06-27-2013   #4 (permalink)
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I would say forget the headers and get this intake...

Here's a magazine article about it.

Mustang Cylinder Heads - Non-PI Head Secrets - 5.0 Mustang & Super Fords Magazine
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Unread 06-27-2013   #5 (permalink)
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Agree with the above, forget about shorty headers. Only worth about 5 hp and they're a real mothertrucker to install. PI intake swap is where it's at.
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Unread 06-27-2013   #6 (permalink)
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Thank-you guys for the replys.

Im going to be doing the headers either way because i want the sound hah.
But about the PI swap, how tough is that to install? never done on myself and wouldn't know what to expect.

But that seems to be the issue, as 3forums have lead me in the right direction about the heads.

-Jay
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Unread 06-27-2013   #7 (permalink)
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If you're getting headers get long tubes or save the money, and I would add an upper plenum to your plan as the stock one is a bottleneck, and maybe underdrive pulleys, and the PI swap mentioned above. I hope you checked out the bottom end before starting this, I'd hate to see you find a problem right after all this work.
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Unread 06-27-2013   #8 (permalink)
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+1 for the plenum upgrade and UD pulleys. Those are two of the best bolt-ons, as far as price for HP gained.

As you already have an off-road H-pipe, longtubes would be the best choice, if you still want to buy headers. It'll be increadibly loud, and your floor panels will fry eggs. You have been warned...
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Unread 06-27-2013   #9 (permalink)
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He has the upper already. That 78mm throttle body is built into it.

BBK 78mm Mustang Throttle Intake (96-04 GT) 1780 - Free Shipping!
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