[Apples]

I was poking around under the car today and I noticed the Nowack set up has each bank having two collectors each grabbing two headers then a foot or more further down those two merge in to the main pipe heading south on that side of the car.
My question is on the reason for that version and the other 4 into 1 set up that others like SS use.

Wonder if anyones got the same set ups except for the header config and if there's gains in power/flow and sound from one to the other..

Apples

 

[russap5]

Evolve could answer this pretty easily as they just tested both styles back-to-back. Both provide similar power gains, but it is where the power is increased that differs.

 

[Apples]

Is there a thread on this evolve test and what they noticed between the two versions?
Was this test done to see what type of set up they would make/sell?

Stuart

 

[Bimmerbear]

In a very basic nutshell, 4-1 headers will give you more top end power while 4-2-1 will give you better mid range power.

 

[BenTong]

Both links are to the same thread. The thread starts off with 4-2-1 headers and the second link goes to page 28 where the talk about 4-1 headers starts.

http://www.m5board.com/vbulletin/e3...15-evolve-e39-m5-headers-inc-dyno-graphs.html

http://www.m5board.com/vbulletin/e3...evolve-e39-m5-headers-inc-dyno-graphs-28.html

 

[E55AMG2]

The short answer is the way they generate part throttle torque and the way they perform at the top end. There are a few twists and turns, but that's it in the broad strokes. If you're bored one day I'll gladly explain it to you.

 

[havasusteve03Beast]

The power gain and expense would not be worth you getting rid of your Nowack headers Apples....Unless your itching to spend some cash..

 

[wkd928]

Apples, I've also got the Nowack headers on my car. I think the new evolve headers are very nice both in the design and execution, they use a very long primary to keep low end torque but benefit from 4-1 simplicity in installation and maybe more top end. It will be interesting to see how much bhp cars with cams and headwork will make using these headers.

Sal spent some considerable time with my car on the dyno last weekend after it's engine rebuild, it's now making more bhp than it did with Nowacks original tune.

 

[E55AMG2]

Apples, I've also got the Nowack headers on my car. I think the new evolve headers are very nice both in the design and execution, they use a very long primary to keep low end torque but benefit from 4-1 simplicity in installation and maybe more top end. It will be interesting to see how much bhp cars with cams and headwork will make using these headers.

Sal spent some considerable time with my car on the dyno last weekend after it's engine rebuild, it's now making more bhp than it did with Nowacks original tune.

I got some of the play by play :confused3

 

[wkd928]

Yeah but in the end it all came good(!) Funniest part of the day was following the evolve car the two miles back to the M1, the new 4-1 design really sounds like a race car.

 

[E55AMG2]

Yeah but in the end it all came good(!) Funniest part of the day was following the evolve car the two miles back to the M1, the new 4-1 design really sounds like a race car.

They certainly do. Imagine with Kelleners back boxes....

 

[bimmerule]

Did Evolve ever bring the LHD 4-2-1design to market? My car doesn't live on the redline, so was hoping to find a 4-2-1 upgrade over stock. Dinan costs as much as a S/C so that's a non starter.

 

[wkd928]

There new design keeps low end with very long primaries, it works as well as the previous design and is easier to install as well.

 

[BenTong]

I don't think so.

I just remember RHD 4-2-1 then LHD 4-1 and now RHD 4-1