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Headers question

921 Views 24 Replies 8 Participants Last post by  tony1963tony
This "may" raise some eye brows and some asking themselves "What the hell is this guy thinking?" None the less, curiosity and improved engine life, performance and slightly better fuel economy (?) does make me consider the question quite seriously.

The question - Can you buy true "Performance Headers" and a "True Tuned Exhaust System" for a 2007 E350 3.5 ltr V6 with factory fitted Sports Package?

The logic, headers and a tuned exhaust system produce "freer" air flow and reduces back pressure. Therefore, theoretically, that in itself should increase BHP and Torque as well as improving fuel economy, even if only marginally I have read that in some cases, BHP can be increased by as much 40 BHP and Torque can be increased by as much as 30 Torque. The 3.5 ltr V6 already produces 278 BHP I believe so getting it above (fingers crossed) would be a huge plus, especially for long distance/highway driving.

Naturally, there are many other things could be done, a cold air intake, turbo charger, performance chips etc etc etc. From what i can tell, the headers + exhaust offer improved BHP and Torque for a reasonable price.

All thoughts and opinions welcomed. And yes, buying an AMG or Black would be the "easiest option" ...... I wish; although I do know where there is an early model SL 550 pure AMG for sale .....
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· Registered
2006 E350 (W211)
Joined
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72 Posts
Personally I would leave everything as it is with the idea of doing something to what you've got .
I've got a Sept. 1991 built , sold in 1992 560 SEC . Didn't want to add anything to it that wasn't what came from the factory , with an exception :
I first changed the oil over to pure synthetic ( 0-40 ) then put a K & N air filter in the housing , 3 prong spark plugs of the highest quality with high quality wires , a copper pick up distributor cap / rotor then put 45 lbs in the tires (not recommended on rainy wet days ) for cruising and distance driving only . Make sure your fuel filter(s) are new and just doing these few things you will notice an increase in its response and pep . Plus better mileage .
Just something to think about .........
While you might get an extra 1/4 to 1/2 mpg (max) running your tires at 45 PSI, you’ll be rewarded with substantially diminished tire mileage as they wear down the center (not to mention poorer ride quality and potentially worse cornering) the cost of which will dwarf any savings in gasoline.
 

· CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
Joined
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50,164 Posts
Personally I would leave everything as it is with the idea of doing something to what you've got .
I've got a Sept. 1991 built , sold in 1992 560 SEC . Didn't want to add anything to it that wasn't what came from the factory , with an exception :
I first changed the oil over to pure synthetic ( 0-40 ) then put a K & N air filter in the housing , 3 prong spark plugs of the highest quality with high quality wires , a copper pick up distributor cap / rotor then put 45 lbs in the tires (not recommended on rainy wet days ) for cruising and distance driving only . Make sure your fuel filter(s) are new and just doing these few things you will notice an increase in its response and pep . Plus better mileage .
Just something to think about .........
A member paid a renowned competition engine builder a boatload of money for Max everyday drivable power in a M117 engine. Special headers + front to back exhaust system were all done, but their flow computer simulations showed the 560 intake runners the main culprit. Looking at the 450 intake manifold showed better flow runners, they cut it open, and build / increased deck height for more flow. With some other improvements, I think they got to 370hp everyday usable power. I believe the member spent close to $20k US. There should be a good thread in R107 or W126, or both.

Several members went to Mercedes TRY-Y headers, each cyl bank goes into dual per side downpipes on either side of the car. Got rid of the kidney looking side resonators for 2 in line staggered hush puppies, a high flow 2 in, 2 out Kat (eliminates need for cross pipe), and muffler. Dyno showed a 39hp increase.

It's somewhere in this widebody rebuild thread Project Arizona, The Rise of the Phoenix...a Wide Body story
 
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