Looking for Downpipes/Headers & Race Cats - 4.8is

[PropellerHead]

Originally Posted by IslandRoad

I have seen in a thread back that supersprint e39 m5 headers might work also? Not sure but might be worth looking into.

SS E39 headers will work on any M62 540 or X5 4.4. The OE E39 M5 headers and M62 540 are the same. These are the SS E39 M5 headers on my supercharged E39 540:

[OnTouring]

Are these really for the 4.8is? PN 50 053 200 (p.6) is listed for the 4.6is?

[IslandRoad]

Originally Posted by OnTouring

Are these really for the 4.8is? PN 50 053 200 (p.6) is listed for the 4.6is?

I do not think they are at all 4.4 and 4.6is only from what i am seeing also.

[BMW-x5-48is]

Originally Posted by OnTouring

Are these really for the 4.8is? PN 50 053 200 (p.6) is listed for the 4.6is?

Yup I noticed that too.. The guy is saying they will fit 100% on the truck.. He sent me the pic below... I am hesitant in paying the $$... because if something does not fit then, I am screwed, not only will I have to put the old headers back but will be stuck with these new ones that dont fit.. thinking it over today... he sent me this pic from HAMANN saying he had a 4.8is and sold it for a new X5M and has the parts.

[Green Dragon]

Send an email to, or call up Hamann? Ask those kids. Problem solved. Maybe you can pick up a set from them directly so you feel more secure in the transaction?

[BMW-x5-48is]

Originally Posted by Green Dragon

Send an email to, or call up Hamann? Ask those kids. Problem solved. Maybe you can pick up a set from them directly so you feel more secure in the transaction?

i tried zero response. I called, I sent 2 emails. HAMANN is harder to get an answer out of then anything, especially for older parts/cars.

[4.8isX5]

Propeller,

May not be on bmws, but ive read before that alot of times the headers arent compatible with lets say a 2002 e39 4.4 motor and a 2002 x5 4.4 motor for reason being the lengths/heights etc and firewa make a difference in how their designed.

Again may be wrong but for example on my pathfinder which is a VQ35DE motor same as 350z, z headers will not fit. Same motor and rwd setup though..

[525iT_Feen]

Its weird. When you check the part # for the gaskets they are the same but the cats are completely different and specific to the 4.8iS. So they will bolt up out of the car and I guess it makes sense that they are routed the same but then turner states the 4.4 N62 SS headers and 4.8iS to not be compatible.

[BMW-x5-48is]

The CATS he has are for the 4.8is tho so it might be that those headers will fit 4.8is also..

See pics

[IMG][/IMG]

[IMG][/IMG]

on the headers is part #50 053 301 which in HAMANN catalog says for: 4.4i, 4.8iS from MY 10/2003 Item No. : 50 053 301

[IslandRoad]

Curious what would be the HP gain from these? I would assume u can compare the gain as same for Supersprint headers. Also they would require a tune to take full advantage of them also. Does anybody have any dyno sheets or logs to view that show real world gains?

Also is there any cheap way to flash these cars with a k-line or brav-tec cable? I have this ability in my 335i N54 it's pretty much open source tuning. Not sure if this platforms has that ability?