Back in the day I threw a set of ceramic coated Kooks long tube headers on my '06, along with an X pipe and FRPP (Borla Stinger) mufflers.
Beautiful looking headers and well built, but expensive and I thought they sounded like shit.
I hated that exhaust note.....worse at some rpm than others, idle wasn't bad, but higher up it sounded terrible in my opinion.
It's all very subjective, and what sounds terrible to me might sound great to others.
Homework time for sure.
Very true. Sound and exhaust note are subjective and open to personal taste.
This is a good jumping off point to share my experience.
Like Kevin, I also got a cat back exhaust as one of my very first mods on my ‘05 car that preceded the ‘06.
I was completely new to the modding hobby.
But I did a bit of reading and research before pulling trigger.
I concluded more flow was a good thing for future consideration.
And, the 4.6, like the 5.0 to a slightly lesser extent today, was prone to drone at around the 2000 rpm range.
So I settled on the Magnaflow Magnapack cat back system.
They don’t make these anymore.
Closest now is probably the competition cat back system.
The first objective was achieved easily as the mufflers on this system are wide open, so lots of flow for future mods, and louder sound instantly.
The second objective of avoiding drone, not so much.
Literature said these did not exhibit much drone.
That was not true. They exhibited a good amount of drone over stock, which was no drone.
So you adapt and learn not to drive at 2000 rpm.
Rear end gears help this situation.
Then, after CAI, UD pulleys and tune, I wanted more.
I did FRPP Hot Rod cams.
Loved the sound and extra go of these.
Coincidentally, while at the shop getting this work done, I heard a car with long tubes.
I asked if those would make my car louder and if they would add power?
The answer to both was a confident yes.
So the following spring I returned for the previously mentioned BBK long tubes and high flow catted X pipe.
To be honest, I prefer the sound of H pipes but Dasilva was doing a lot of these BBK pipes at the time and they put up good numbers on the dyno, and were budget friendly.
So I went with them.
My experience with my long tubes is that I loved the sound.
Big difference with Mike is that I already had cams in the car.
The cams give a more lopy and aggressive sound.
My experience with my long tubes was and still is positive.
I liked my exhaust so much on the ‘05 that when I sold it, I unbolted and kept it all to transfer onto the ‘06.
I also added Hot Rod cams as an early mod to the ‘06 because by then I had learned that, the 4.6 3 valve motor responded well to the combination of the HR cams and long tubes.
In fact, the cams and long tube combo was good for an extra 40 hp gain above whatever the CAI, pulleys and tune had already garnered.
All of a sudden you had a car a lot closer to the 400 hp range than the stock 300 hp range.
On a % basis the 4.6 3 valve responds better to cams and long tubes than the 5.0, because the more Ford evolves the 5.0 the less power they leave on the table.
For this reason, and cost, cams are not a popular mod on the latter 5.0 generations.
Cost because it’s 4 cams instead of 2, and tuning a 5.0 with cams is significantly more intricate and time costly than the 4.6.
On the 4.6, a 20 hp gain with the HR cams at a certain price was a good investment starting from a base of 300 hp.
On the 5.0, for way more money you are now getting less hp gain and starting from a 450 hp base, the investment is not so attractive compared to percentage of gain.
I don’t think I’ve ever heard or come across a stock 4.6 3 valve with long tubes like Mike had.
Mike was a pioneer also.
All the 4.6’s I’ve heard with long tubes, and it’s not that many apart from mine, had cams or were supercharged.