Some real exhaust info for 4.6L V-8's
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Joined: May 2001
Posts: 65
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From: san diego, ca
Some real exhaust info for 4.6L V-8's
Hey all- I keep reading a million posts on exhausts, so here's a summary of my experience. On my current '01 4.6L, I have had FOUR different exhausts. No i'm not nuts, but I had to get the sound / performance right. Here's what DIDN'T work:
Flowmaster 40, 2 1/2 in / out, stock pipe. LOST LOW END, DRONED BADLY and WHISTLED AT FULL THROTTLE.
Dynomax Super turbo, w/ 3" pipe cat back: Gained some low end back, but sounded like a friggin vacuum cleaner, and started to rust and shoot packing in 4 months. SUCKED BIG TIME.
Bullett with 3" cat back, 16" model. OK sound, cheap install but LOST low end and was worried about packing burning out. Got louder and louder as it burned out. JUNK, plain and simple.
Spintech 3" in / out, truck model, with FM "y" pipe, 3" cat back:
Very happy. Have what feels like stock torque at low end back (with 33" tires and 3:55's!) and vastly increased horsepower at redline. Sounds like a NASCAR at full throttle but just nice and meaty at idle and rolling around. NO DRONE ON THE FREEWAY.
Built like a tank and warranted for life. Spintech goes way back with racing mufflers, but is new to the consumer market. ROCKS!
Just remember, according to my division tech rep from Ford, they DO NOT RECCOMEND free flowing mufflers for the 4.6L- you need a combination of low RPM backpressure and high RPM flow to get the performance you want. EACH muffler has a DIFFERENT POWERBAND- some low, some high. Your free flows are all high end power, and the same with most FM's.
Also, don't get crazy with pipe size- with duals, don't exceed 2" and 3" with single. Once again, you'll shoot your backpressure to hell if you've got too much. In the end, as long as it sounds great and your power is about the same (you're not gettin' that much from a muffler anyway!), go with it! I personally do reccomend Spintech, though, at least for the 4.6L. Their tech guy told me that they engineered in some (1500-2500 RPM) backpressure in, but via their advancing baffle size, free up and open past that. You can actually feel it when your driving. Check it out!
Noel
Flowmaster 40, 2 1/2 in / out, stock pipe. LOST LOW END, DRONED BADLY and WHISTLED AT FULL THROTTLE.
Dynomax Super turbo, w/ 3" pipe cat back: Gained some low end back, but sounded like a friggin vacuum cleaner, and started to rust and shoot packing in 4 months. SUCKED BIG TIME.
Bullett with 3" cat back, 16" model. OK sound, cheap install but LOST low end and was worried about packing burning out. Got louder and louder as it burned out. JUNK, plain and simple.
Spintech 3" in / out, truck model, with FM "y" pipe, 3" cat back:
Very happy. Have what feels like stock torque at low end back (with 33" tires and 3:55's!) and vastly increased horsepower at redline. Sounds like a NASCAR at full throttle but just nice and meaty at idle and rolling around. NO DRONE ON THE FREEWAY.
Built like a tank and warranted for life. Spintech goes way back with racing mufflers, but is new to the consumer market. ROCKS!
Just remember, according to my division tech rep from Ford, they DO NOT RECCOMEND free flowing mufflers for the 4.6L- you need a combination of low RPM backpressure and high RPM flow to get the performance you want. EACH muffler has a DIFFERENT POWERBAND- some low, some high. Your free flows are all high end power, and the same with most FM's.
Also, don't get crazy with pipe size- with duals, don't exceed 2" and 3" with single. Once again, you'll shoot your backpressure to hell if you've got too much. In the end, as long as it sounds great and your power is about the same (you're not gettin' that much from a muffler anyway!), go with it! I personally do reccomend Spintech, though, at least for the 4.6L. Their tech guy told me that they engineered in some (1500-2500 RPM) backpressure in, but via their advancing baffle size, free up and open past that. You can actually feel it when your driving. Check it out!
Noel
Senior Member
Joined: Mar 2002
Posts: 333
Likes: 0
From: SW MO.
Are you saying we are not going to gain very much power over our stock exhaust? I have often wondered it that was the case here, alot of people have commented on the loss of low end with there new exhaust. That is why I have stock exhaust yet on my 4.6. However I have also read that some people actually gain low end with the magnaflows. Just what I have read though, I wouldn't know.
