robmypro

Uh oh.

Charles@dundonmotorsports

Are you talking about how quiet it is when crusing?

robmypro

Wow. That is amazing.

911_RS

Yep! The stock valves will still open after 3800-4000rpm even the PSE button is off while DMS valves will remain quiet if it's off.

hypeber

will this pass smog check and what about drones? nice setup though...very tempting...also how much weight something with this combo?

qbix

Stock RS pulling against two Speciales.
It pulls like 4-5 car lengths. The white one had a jump start but the result is the same.

kaboobie

Jamie


The DMS headers has to be specially made for the Akra exhaust ?
I assume the headers doesn't work for the akra evolution system as it has no valves right ?


911_RS


Does it drone between 2000-3000 rpm ? Mine drones a bit with akra headers that is

911_RS

The headers have valves, works perfectly too with the OEM center exhaust. It's just my personal preference to use the Akra center. No drone at all! And of course way better power than any other headers out there... Tested almost all the leading brands.

Macca

Amen!!

blindfold

Is the reason to go with a Akrapovic's center muffler is for the sound i'm assuming? I see AK's site lists their AK race race line catted system adds 27horsepower and 36lb/ft both at 3900rpms and maybe these are at crank figures versus dundon's (27hp) at wheel figures, are there any other differences between ak's race system vs dundon's headers? It seems more difficult than I anticipated to search for a Akra race system gains to show actual numbers gained on the RS. So if anyone can share some insight, greatly appreciated.


So I read a bit more and found out the said AK race system adds roughly 30hp, vs 40hp of dundon, so just rough estimating Akra race would gain about 25% less, 25hp gained on the dundon, so we are talking about within 10hp here... maybe my logic is incorrect...

SandmanTR

Ha! Love the R2-D2 under the end table! Amazing collection for sure!

Jamie@dundonmotorsports

The gains of the akra headers at 3900rpm are due to the lack of the valve, this creates drone and the power isn't all that helpful at such a low rpm. The akra race makes 11hp from there website at 8400rpm.

Dundon Race adds 40whp for a GT3 and 25whp for an RS at 8200 rpm where you would want it!

The use of the akra center muffler was purely by the customer as they liked the look of it. It isn't necessary for the gains and isn't really necessary as the RS uses a Ti muffler from the factory...

Take a look on the www.dundonmotorsports.com for the gains and dyno graphs.

GT3

drdonger

Would love to hear sound clips also.

Jamie@dundonmotorsports

Here you go, 911_RS with his white 991 GT3RS demonstrating the Dundon Race Headers and Akra center