runet

Is the side delete used valved ones with two pipes into center muffler, or single pipe version?
Will this muffler drone like OEM below 3k if single pipe side delete is used?

Jamie@dundonmotorsports

Drone is controlled through the upper longer chamber in the muffler. So valved side deletes are required to eliminate drone with the OEM muffler or the Dundon GT3 Center Muffler

runet

Thank you. Will have to get the valved type then and replace my single pipes.

F1CrazyDriver

This is just a general question.
Do you happen to have data on temperatures of engine, engine bay, exhaust system ? I would assume the more baffled an exhaust is - the more it affects temperatures internally in the motor and externally, at least from my experience w/ Turbo charge cars.

shogun974

I use cobb accessport for dataloging.
I think the engine bay really doesn't suffer from exhaust.

Exhaust is really underneath, well ventilated and I don't think it can change anything to engine bay temperature.

911 is a car with a very special conception.

Intake manifold and exhaust manifold cannot talk to each other and doesn't belong to the same ereas.

daveo4porsche

good day at Laguna - my write up is here!

https://rennlist.com/forums/991-gt3-...f-silence.html

Jamie@dundonmotorsports

We've looked at EGT and modeled EGT on the dyno, with Race Headers, lower than stock, with our catted system lower than stock, OEM muffler and Our mufflers no difference.

Jamie@dundonmotorsports

Race version is complete and testing on my 991 GT3, verified fitment on both 997.1 and 997.2 for the Street (quiet) and the Race version. Will get some videos up of our Race Headers and Race Muffler from our 991 GT3, and will be back at the track this week. Finalizing the tip design and reconfirming production qty part costs getting ready to release to Production!

ngng

if you can't do OEM style removable tips, how bout 100mm out of the gate?

Jamie@dundonmotorsports

This is what is happening, 100mm with a slight angle cut (what we call slash cut). They will be removable and swappable to turn away pipes for both mufflers (no idea why you'd use turnaways on a race muffler).

ngng

cool, sounds promising! driving at laguna would be nice...even though i hate laguna

garyever

This sounds like a great solution for that irritating center muffler problem. I would like to get on your delivery list for the "race" model (Hopefully there will be no big surprises re pricing). I drive a modified 2007 997.1 GT3 dedicated track car with both side mufflers deleted and stock size dual entry exhaust pipes each side of the OEM center muffler. The 100mm angle cut tips are ok with me. Please let me know when you have firm pricing available. Email garyever1@gmail.com and/or call gary 541.400.0330

Jamie@dundonmotorsports

Hi Guys,

We're taking preorders for those that want to secure an Orange (quiet) or Black (loud) Lifetime Center Muffler. We're starting with a total of a 50pc batch, so don't wait, we already have 20 guys signed up!

We have the parts inbound and should have them in about 3 weeks. From there assembly begins, so we're shooting for the end of October, early November to begin shipments.

Intro pricing is $3250, use the code intro_muffler at checkout.

Any existing Dundon Header customers contact me.

Again to summarize:
321 Stainless Steel Construction
Louder than OEM (Black)
Quieter than OEM (Orange) options
Lifetime Guarantee
4" tips in PVD Black
Optional Turnaways at additional cost for the track guys.

Here's the link to our website.
http://www.dundonmotorsports.com/por...center-muffler

ngng

Maybe I missed a reply. What were the results for this? Did you also get a reading with your headers?

Jamie@dundonmotorsports

In our testing we saw 10-12dB reduction at the ridge. From 104 with the OEM muffler down to 92-93 with the Orange (Quiet) Center Muffler. The all 4 cars that were tested passed at Laguna. 2 997' GT3's one with side mufflers one with side deletes. And 2 991 GT3 again one stock and one with side deletes all passed at 92dB.

no guarantees that your car will pass Laguna, but all the testing we've seen does pass.