I am looking for a legal Exhaust system that will bump the size of the piping to 2.5 inches. I would also like to know what headers and X pipes or H pipes (legal) would fit on this car. I just got the car and have been looking all over the net.

What is the stock compression with this 4.6 stock vs the 99 + heads and intake manifold from the GT? What would the power gains be?

What shot of nitrous would be perfect for the stock block vs the 99+ heads and manifolds?

Thanks for all the help!
SlowC

2.5" will absolutely kill your low-end torque. Since you talk so much about Rustangs, you probably aren't aware that in a 4,000 pound car you need every last inch-pound of torque that you can scavenge. Don't do it. The OEM 2" is sufficient for up to ~300bhp.

Obviously you haven't "been looking all over the net" because you aren't aware that there are no ready-made headers, nor Mustang-style H-or-X-pipes made for these cars...of course, you're a skilled web surfer, so you'll challenge that for sure!

Go right ahead and put a GT intake on your GM. Sure, it's the same part number, but hey!, it's a GT part, so it's just GOTTA be better, right?

Stock compression with NPI heads (same as a '96-98 GT, but you already knew this) is ~9:1. Swapping PI heads onto a NPI block with NPI pistons will yield ~10.4:1 compression.

And of course, you already knew that anything under about a 100-shot of laughing gas is probably OK, at least for a couple passes, till the bottom end disintegrates, or the intake manifold pops.

But you already knew that, having been "looking all over the net..."

the words "fast" and "Grand Marquis" typically don't belong in the same sentence, and unfortunatly even after a lot of money getting thrown at them...they still aren't too terribly speedy. I say this just so you know what your getting in to.

The best way to do it is a supercharger, plain and simple. That'll net you ~13's in the quarter...which is enough for most people.

What year is your Monkey, anyway?

www.ZeusAutomotive.com


ask and you shall receive...

--Russ

Of course, typically neither do "fast" and "Crown Victoria" or "Town Car" either...

Well Ronman, thanks for your helpful insite.......right

I also included the 99+ heads... this was just information that I found, got it?

I appreciate the other members advise but this ronman, quit screwing yourself.
Who said that I was a skilled net surfer? Obviously if I could not find it, I am not skilled.... Man you are blessed with many talents!

Ignorance is Bliss..... don't you think?
SlowC

Bite me.

HEADSWAP.

I am getting statistics from Ford Engineers soon, as to modify our vics as well.

Excuse ronman, hes a nice guy once you get to know him.

Watch out for Ronman. His bite is a LOT worse than his bark, and he's only barking at you right now.

If you have single exhaust, then you could run a factory dual set-up with the H-pipe. Larger diameter than stock is going to require custom work. 2.5" is a bit of over-kill if your not pushing alot more power. 2.25" would be a good one-step-up a little better feel and sound. (depending on the mufflers you choose) Figure the main restriction in your exhaust isn't the parts after the converters, it's the converters themselves. Sounds like your in an area that does inspections, so you would have to find out what they would red flag and what they wouldn't. Around here as long as you have the converters installed and you pass the sniffer test they don't care.

As stated before....as long as you stay under 100 shot you should be good to go on the funny gas. Many on here won't recommend it for longevity reasons, but too each thier own. It's the cheapest bang for the buck to make higher HP #s.

Ray

I say fast and Grand Marquis may not belong in the same sentence, but mine feels every bit as fast as it should...and it does leap when you ask it to...

You can do anything described in any part of these forums to a GM that you can do to a CV...

chips...

mufflers...

intake modifications...

different axle ratios...

weight reduction...

move the battery to the trunk...

sway bars...

coil springs and shocks...

a big ol tank of nawwwwssssss...

whatever...

I'm happy with a glasspack muffler and a cut airbox...the sound is what I was after because I already had the speed...

Exactly, Alan.

And, contrary to what several morons here think, you can do all the same stuff to a Town Car, too.

Morons.

These cars are simply a 4-door Mustang. Sure, there are differences here and there but it's 98% the same thing. The Ford aftermarket is huge.

Reinforce the 4.6 (several good recent threads on this), some form of forced induction, address the tranny & torque converter, and you're in business. Is it cheap? No, especially if you can't do most of your own work. And yes, I'm in this boat too. Damn the finances and full speed ahead!

Do they make a good race car? Well, they could be but I'd concentrate on making it a useful car - one that moves when you hit the pedal and still can take 4-5 people long distances in comfort & style.

And no, the weight doesn't mean squat to me. Look at the Lightning. Look at my Stealth that weighs 4035 lbs and runs low 12s with a mildly-modded V6. A CV is maybe 200 lbs heavier but has half again as much engine and 2 more cylinders. That means more potential - it's just up to you to reach it.

Wow
"Mildly modded" V6 Stealth.. yeah right .... another relevant car comparison.. a twin turbo stealth with 4 wheel drive versus a vic/gm.... good grief...

If you havent modded your stealth then where are the 12 second slips?

anyway... lets get back to the post..

This is not a 4 door mustang... let me repeat that.. this is not a 4 door mustang.... they use the same automatic (one and only) tranny and the base mustang has a 4.6SOHC... same as the vic.... thats about it folks

take the pcm out of a mustang and stick it in your crown vic ROFLMAO

As for headers... we have not seen any... so you have some fabrication to do to make a set fit... not impossible.. but you better be a good welder on top of clever

read about some of the buildups on here and the back posts... there is plenty of correct information

As for Ronman... he just is telling it like it is without pulling any punches..... I noticed you never did specify what year car you are talking about...

if it is a 98 to 2000 you can put a 2.25 inch borla on it, but the price is no longer cheap as they did not sell a lot of them...

What in my post wasn't accurate?

Same engine. Not identical in every way but it's a SOHC 4.6 that's damn close to the Mustang version. More importantly, there's nothing keeping you from modding it just like an automatic Mustang.

Going truly fast and staying naturally aspirated ain't gonna happen, at least not for 2x the budget of a blown car and with less streetability. You can get "quick" but you're not going to go "wow". It's proven that the internals need strengthening before adding boost. I stated that already - is it wrong?

They have the same transmission. Ok, so where was I wrong with this? They have the same rear end. Ok, that just about covers the drivetrain - they're fundamentally the same.

The keys to going fast are the engine and driveline. If they have the same thing, you can do the same thing! Jeeze, what's so hard about that? I don't mean everything will bolt on between the two platforms but it's the *upgrade path* that I'm referring to. You can't use the *same* exhaust but you can use *an* exhaust. You can't use the same PCM tune but you can use *a* PCM tune. Same goes for everything from torque converters to shift kits to gears to forced induction.

There's nothing magical about my Stealth. It does have mild, simple bolt-on mods and the timeslip & video are on my site (I'm trying for 11s next Sat). The only advantage is has over the 4.6 is that it comes with forged pistons and rods from the factory. I'm still shoving 4035 lbs down the track faster than 12.5 seconds. You can't change physics - you make a CV with ~ 450 hp and it'll do the exact same thing.

50% more engine and only 2% more car means the CVs aren't to be counted out by any means. It just means you have to buy all the parts to put it on a level to handle the HP. The potential is already there.

Don't be so pessimistic about the capabilities of these cars. It's not cheap, and much of the route is unproven at this point. That doesn't mean you should just give up after a couple of mods either.

It also depends on what you hope to get out of your car. It's much easier to run 14s than it is to run 12s. Not everybody wants 12s (or 11s or whatever). The point is that this platform can go fast if you want it to. It just depends on the size of your wallet.