HA! steel wool scrubber in the muffler! They stole my idea lol. I think it will be too restrictive for the race exhaust hence negates the benefit of a straight pipe. I like the idea of a vacuum control flap which create more back pressure below 3000 RPM much like the OEM set up. Maybe we can retrofit the OEM vacuum control flap (modified flap with honey comb openings) to work on the race exhaust ...

 

****, you caught me off guard.
i was like how did you know????
then i realized you were talking about the car.
that was 6gt3 #4.

 

Alex, would be great if you can come up w/ a setup that retain the stock rear bumper!!

 

That would be the ticket for me as well...

 

Maybe w/ the larger muffler posted above and then route the tip to the opposite side and exit at the original cut out.. !

 

One of my friends has a 996 GT3 also in white and the car is amazing. I will send him a link of the exhaust clip. He tracks his car on a regular basis as well. I relly like the rear cup bumper without the bumperetts

 

How noisy is this at 6000rpm etc?

Also whats this about torque loss? I thought with new headers there should be an improvement not a loss?

Very interesting stuff though. I like the centre exit look but only solution I've seen over in the UK is too noisy (quicksilver exhaust IIRC).

Sounds great on the 7!

 

Alex,

Firstly, nice build.

Secondly, on the exhaust, what's the dealio with using a balancer pipe so late in the system rather than running it as a full cross over type system? Have you guys looked into the set up differences in terms of power (and noise!).

Cheers,

Tom

 

Subscribed to hear final sound clips to see if it sounds like a 997 '3.

I think the cup bumper is a necessary evil to meet the requirments of getting the '6 to sound like a '7. Although I suppose you could just turn the tips downward instead of straight out the back and still use the factory bumper but then you still compromise as there will be nothing in the stock exhaust holes in the bumper then. I'm all for the weight loss aspect of the system without being as loud as bypass pipes though.

Also in to see if there's any power gain from the system. I'm curious becasue if I remember correctly there's also slight port differences in the heads on the 997's and a bigger throttle body to bring everything together flow wise for the bump in power. Curious to see if there will be much of a difference from exhaust alone.

 

Thank you!
Cheers man... and of course... Hmm well maybe not in this rain
Haha too funny!

Thanks Bara... it's going to be so much fun... I'll post a report at the end of the week with a few more things

That's right it's been Mootyfied!

Thanks pal I still owe ya a ride in Kermit eh

 

SUBSCRIBED!!! caps were on purpose!

 

Same here.

 

Heh thanks... She's got a good road ahead of her and I will keep you guys posted on this

Thanks!

The major difference is the exhaust side of things as well as the intake manifold (TB included) but you're right about the bumper. We had to do it this way because the 997 cup cars use these headers and they're such an improvement over the 6s. Plus we get to use our track exhaust and dump the weight.... I'll keep you guys posted on this as and when we get there. Tuning is targeted for late Feb (and I'll tell you guys why soon).

Thanks Tom and the balance pipe is merely for "help" in the resonance department. On the 7 she's decent to drive as a result in 6th gear at 3000rpm and 75mph. As far as introducing an X I'm not a firm believer that it works well. Porsche keeps those banks separate. It might make for a neat sound but it's still a restriction that I don't want to induce. We've figured out that the 7GT3s work really well this way and based on what we're doing on this 6 I want to continue that route (not to mention the sound)

Hey Dan at 6K it's very noisy on the 7. No qualms about it. In terms of the torque loss it's a small amount below 3K (6hp) due to the difference in back pressure etc... but what you gain after that (and save in weight) makes it worth it for track cars. This would be too noisy for the UK. We use our center section on the 7s and those are fine but not this;(

Thanks and yes I hate the bumperettes too so the cup bumper rids those

It honestly wouldn't fit There's just no room back there for it to fit as much as I'd love to try/use that;(

I agree and we're going to try for sure. I just like how the 7s sound vs the 6s stock vs stock and even modded vs modded. But I've not given up either

No doubt... you're right. Won't be doing Laguna although it's fine for the other tracks

You are so right... We certainly talked about the flapper thing a la 997 but then again this car's goal is weight reduction (safely mind you) and it's going to be raw at the same time.

Still too large The back side between the motor and bumper is so tight and factor in that we're using the 7 headers and cats it would make for a bit of a clusterBLEEP I like the idea although with a bone stock GT3 failing laguna I pretty much give up on that track unless it's on a Playstation

Thanks pal.. this car is a gem at this current price. It's the last car (and GT2) without electronic nannies too!

Hmm should I get TWO sets of tires.. I mean I want you to have a proper test and not sure just one set would last We are starting with 295s here lol!

Thanks man... I like the presies!

Heh thanks... we're doing this as and when we can (got real work to do!) but I'm pretty stoked about this car and where it's going

Bah with laguna! Video gaming only for me on that track You're on to something with the valve... but to be honest the way the cup cars run with the same set up... you never see them at below 3K rpms (unless they're in the pits lol) so it's such a low range for this cars that I'm ok with it.

And the ECU/tuning will be quite different and started from scratch (actually part of the fun). We'll be trying a few things to go with the tuning process too because there is some ground to make up with the 6

 

I don't understand why the OEM manifold isn't equal length? All the aftermarket ones of repute on the 6 are. Then again on the 6 cup they used the same manifold as on the road cars so its probably a regs/keep it simple thing rather than for optimisation? As I said on rennlist, bit of a bummer to buy a new manifold and not be equal length!

If you can come up with something simple that lets us bolt on an extra muffler and get onto uk trackdays I think you'll get a few sales here. Hard though I know...

 

I do know what you mean.. on the 7s they really did do a fine job by comparison. It's almost like on the 6 they took the C2 headers and just made the ports larger Not too much progress this week since we had a full house although for the life of me it's sad to see the 18 inch wheel "business" so dead Seems like everyone's moved on to 19s (and gosh-darnit) 20s.... As a result we did these