What a difference...
Gentlemen,
The FMS Headers are an improvement over the stock manifolds. And if you're looking for middle-of-the-road performance, they will work fine. And, the FMS Headers do have 1.625" primaries. However, they forget to tell you, you only get 2 primary tubes instead of the expected 4, one per port, yes?
But, when you're looking for peek performance, you may want to consider Torque Monster Headers.
This extra information about Torque Monster Headers should help explain the difference in both performance and why the price:
From our baseline test, we increased the torque by 35 ft. lbs. and hp by 20 over stock and moved the peak torque curve down 200 rpm. Stock, peak torque was around 2,400 rpm and with our headers installed, it was around 2,200 rpm.
Our headers are designed for torque on a truck motor, but will also handle more power because of the added technologies not usually engineered into other manufacturers headers. Our headers fire in clockwise circular order into the collector causing a pulling or scavenging effect. We also use modified merge collector technology to prevent premature exhaust expansion inside the collector which allows the exhaust from each tube to be fed into the exhaust pipe before fully expanding. These technologies help promote faster exhaust exit speed and helps produce more hp and torque at all rpm ranges. You will have great torque at the bottom end and power left at the top end. All this happens with 1.5" primary tubes.
This is an email we received from a gentleman in Texas about Torque Monster Headers.
12-26-04
Bob did an excellent job in packaging the product & excelled in customer service.# My explorer did not come w/the same emission control plumbing (hot air intake riser “EGR”)#as the California ones do, but he quickly sent me a header without the plumbing.
I've got a cold air intake, Jet chip, 75mm MAF, MSD coil packs, JBA 9mm wires#and Flowmaster 50 series 3" exhaust.# All of those changes, plus...
The Torque Monster headers give me plenty of low-end power, plus there's still quite a bit of power left at close to redline.
They also give a nice mellow sound at idle and a pretty throaty sound at full chat. If you like those boy racer sounds (and I, for one, do!) then you'll
enjoy the headers.
Also, the headers are nicely designed and definitely liven up the engine compartment a bit with the ceramic coating.
Nice job, Bob and thanks! James
These headers come with just about everything. There is installation instructions on Video Compact Disk (VCD) and written instructions. They have all the required hardware such as bolts, nuts, gaskets and even a small bottle of Permatex thread-locker fluid. All you need is tools. It usually takes me about 5-6 hours to install a set of these headers. A gentleman in Oklahoma claims he installed them in 3.5 hours.
All the Best,
Bob Pasquale
Tech Performance & Engineering
Torque Monster Headers