/shrug, i just build the cars. performance decision and numbers were researched by streetking and cody, they probably have spreadsheets of comparison data for all the parts available
So what are the advantages of the equal length modified dinan headers over the evosport headers??
From what I understand, TMS, RPI and Dinan seem to all agree that the primary gain in power is from the removal of the primary cats itself, not necessarily the headers. The headers from Evosport, SS and RDSport all work but with the argument above, it's because the primary cats are deleted.
As for equal length vs non-equal length (or pulse tuned designs), I think each design has a different effect on your hp and torque curve. Just my guess though.
From what I've seen I believe the difference is retaining the V10 sound, while the Evosport gives the engine a V8 muscle sound. Also the RPi, when tested against the Evosport headers, had a stronger midrange torque and greater HP gains throughout the band. You can find the dyno comparison through the search function.
From what I've seen I believe the difference is retaining the V10 sound, while the Evosport gives the engine a V8 muscle sound. Also the RPi, when tested against the Evosport headers, had a stronger midrange torque and greater HP gains throughout the band. You can find the dyno comparison through the search function.
That is true! When I had the evosport I hated the sound it makes and decided to decat my stock headers. However, my butt dyno feels stronger acceleration at the high rpm range with the Evosport.
__________________
07 M6 blk/blk
Racing Dynamics RS58 stroker in progress...
Custom headers
Secondary race cats
Eisenmann Race exhaust
Evosport Pulleys
BMC air filters
RPI air scoops
H&R springs
Dinan FRC & rear sway bar
I do not know. Call me stupid but it strikes me as unusual when someone just cuts off the primary cats and calls the stock exhaust manifolds "their headers". Was there header tubular design R&D as Supersprint, Evosport or RD Sport?
I guess I'm a dumb$h!t but I thought BMW designed those stock exhaust manifolds (which actually flow pretty damn good)?
you guys must hate my guts . I'm sorry but all I am is a simple plain speaking guy.
gentlemen,
Ranger
__________________ 2006 M5 Alpine White/Silverstone Upgrades: Engine: SS headers, Evosport power pulley, ASR ECU remap,
ASR custom air intakes, Dinan throttle bodies, ASR Engineering NOS kit Exhaust: ASR Engineering Gen. II exhaust. Suspension: H & R sport spings,Dinan front/rear CF strut braces. Wheels: HRE P40 w/ 275/30/20 and 305/25/20. Exterior: Vorsteiner CF vented hood, Vorsteiner CF front spoiler,
ACS rear deck lid spoiler, front kidney grill & side gills in CF. Brakes: Brembo GT kit, (F) 6 piston monobloc calipers w/ 16"
rotors & (R) 4 piston monbloc calipers w/ 15" rotors. Interior: ACS titanium CF trim. Dyno results straight motor 460 rwhp, on nitrous 581 rwhp/461 lb/ft rw torque.
ASR TT S85 FULL ENGINE BUILD COMING
2007 GT3RS ORANGE / BLACK 2006 M5 BLACK / BLACK 2010 GT3RS DEPOSIT IN FOR AN ALLOCATION
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I do not know. Call me stupid but it strikes me as unusual when someone just cuts off the primary cats and calls the stock exhaust manifolds "their headers". Was there header tubular design R&D as Supersprint, Evosport or RD Sport?
I guess I'm a dumb$h!t but I thought BMW designed those stock exhaust manifolds (which actually flow pretty damn good)?
you guys must hate my guts . I'm sorry but all I am is a simple plain speaking guy.
gentlemen,
Ranger
I hear you but I think it's a misnomer, they probably don't know the stock system are called manifolds vs headers which they hear all the time around here
__________________
__________________________________________________ _ '08 M6 Alpine White on Black | RPi Intake Kit | Straightpiped postcat/resonator
'06 SL55 030 Black on Berry Red (gone)
'06 SL500 Iridium Silver on Berry Red (gone)
'06 E350 (gone)
'99 M3 Black on Black (gone)
That is true! When I had the evosport I hated the sound it makes and decided to decat my stock headers. However, my butt dyno feels stronger acceleration at the high rpm range with the Evosport.
where did you get yours done? Is it is a simple cut and weld job?
I hear you but I think it's a misnomer, they probably don't know the stock system are called manifolds vs headers which they hear all the time around here
Well even the Service Manager at my local dealer calls the stock unit a header. I told him I have aftermarket headers and he was like "but the car already came with headers"
where did you get yours done? Is it is a simple cut and weld job?
If you want it to be permenant it pretty much a cut and weld job, but you need to find a decent muffler shop. I think there is a tread showing what RPI's headers look like...prehaps you can show it to your muffler shop so he can get an idea on how it should be done. Another way, is to scrap out the primary cat and install a straight pipe inside.
Well even the Service Manager at my local dealer calls the stock unit a header. I told him I have aftermarket headers and he was like "but the car already came with headers"
That's hilarious EuroYou should tell him you wanna run a quad header system on your car
__________________
07 M6 blk/blk
Racing Dynamics RS58 stroker in progress...
Custom headers
Secondary race cats
Eisenmann Race exhaust
Evosport Pulleys
BMC air filters
RPI air scoops
H&R springs
Dinan FRC & rear sway bar
you guys must hate my guts 
gentlemen,
2006 M5 Alpine White/Silverstone
DEPOSIT IN FOR AN ALLOCATION
You should tell him you wanna run a quad header system on your car
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