Wonderdan

I remember when got my RS with the GMG bypass and stock headers and drove it around, it didn't take me 3 seconds to make the decision on buying a new Dundon set again... must be a seat of the pants feel

ranger22

One other thing to consider is that idle and revving doesn't really give you the true sound. You need to hear the car under load both hard on gas and light on gas to hear the real music and I just do not know how to accurately capture the symphony.

jreifler

Cross posts for my current 7.1RS and my setup on the prior 7.2:

https://rennlist.com/forums/997-gt2-...l#post19203315

https://rennlist.com/forums/997-gt2-...l#post18743595

yoojeankim

thanks for this post! was looking at different systems and was scared the akra would be too tame

jreifler

With the side mufflers, I think it is. There’s probably some low - mid torque benefit retained by running the sides, but I didn’t notice any dip at all from stock with it configured this way. Conversely, on my .2, there was a noticeable drop in low to mid torque with the Supersprint long tube headers. I think it’s down to back pressure. Long headers = more power / tq at higher RPM. Shorter headers + more back pressure = low end while sacrificing high end.

powdrhound

I think this is where valved side deletes will help as they create back pressure below 4K or so and open up above that thus giving you the benefit throughout the full RPM range. Retaining the valves on the side deletes is beneficial in my opinion.

jreifler

Good points. The Akra kit has valves and I retained them, but really don’t like the abrupt binary on/off at ~4k. Just feels unnatural. Prefer it with PSE unplugged, but appreciate that others might like it.

powdrhound

I run the Soul valved side deletes with the stock center and the ON/OFF transition is very soft, I would say more gradual than with the OEM sided mufflers. I would imagine all the valved side deletes would be comparable.

Vocan

​​​​@yoojeankim says your PM inbox is full and I can’t reply to your PM. Feel free to shoot me your email address or let me know when it’s cleared out.

Auto_Werks 3.6

Woke the gt3 up from a 4 month slumber this weekend. I forgot how much I like the way all the Dundon stuff sounds on this car. It has the long tube headers with cats, and their quiet muffler. It’s a tiny bit loud, but I have to imagine it’s quieter than all the setups that don’t include cats.

jreifler

What an amazing color combo, and AX layout. Our courses are so tight and short by comparison. Sounds a lot like mine with full Akra exhaust.

Auto_Werks 3.6

thanks! We’re picky about where we will autocross. Mostly we like to go where a good chunk of people drive the solo national championship event. This particular region used the phrase “we only train for the Olympics” to describe their courses. Big autocross courses are way more fun than tight pinchy stuff

jreifler

Lucky. Ours are :30-:50 second super tight courses. I did my first in a P Car last season after about 15 years away focused on tracking. Forgot how fun and challenging it is. Decidedly NOT fun in an RS America though. No power, no first gear speed, no second gear low end. Wrong car for the course setup.

Elliotw44

My Kline Inconel system(200 cell headers). Valves open with a Cargraphic controller and a 5K RPM shift point.

GT3_Toby