The white gt3 had that pipe on it

Lowest hp of the three cars and the sound is way too loud

 

Man, I wish I knew it was also a dyno day, I would have brought down the TT for some baselines. Peter was there . . . He's trouble! LOL.

 

Nice work.
Really like the CF trim on the bumper.

Ranger (Sua Sponte)

 

interesting, seems you guys got it all figured out

akro for the win then. What were some of the others running?

I cant wait to see more about this dyno day

 

435hp to the wheels. Wow! So where does that put the actual hp numbers since its not 450 anymore

 

LOL...yep... definite PIG of the group.

 

Akrapovic is simply the cream of the crop. I just put my "old" 3.8 Ak Evolution (valved) system on my 4.0. Truly glorious with the valves open.

Izzone saved massive weight by eliminating those side mufflers and prevented a CEL by keeping the OE headers. If you go with the Ak headers (100 cell cats) you will get a after-cat O2 sensor CEL. EvomsIT can fix that- you send ECU, or FVD has a flashloader now (I ordered one) for instant reprogramming.

Yes/No

1. No side mufflers = no valves = no Jeckyl/Hyde sound.
2. BUT of course the other functionality of Sport mode is still active- all the ECU/PSM/PASM changes.

 

Rob, a little love should bring the power back up.

 

When I get done with the car LOVE will be an understatement...;-)

 

I'm gonna guess around 465hp at the crank...no? But I think these cars make more than 450 at the crank....maybe 460...so maybe in the true 480hp at the crank range.

 

All very good info ~ cant wait to see the dyno sheets. Thanks everyone for the lessons in exhaust tuning

 

Friends,
Did anyone put a stock center muffler without the side mufflers on the dyno to compare to Akrapovic Sports Cup setup as tested by Izzone? I am tempted to go that route on my 4.0.
Many thanks, w

 

Akrapovic provides a little plastic plug with the Sports Cup kit to cap the vacuum tube. Nothing so primitive as a screw.

 

Trakcar is installing that system as we speak. Porsche motorsports makes exhaust tubes that connect the cats to the rear muffler, $1,000. You will have to fab a block off plate for the top hole

Ive heard rumors of the heat making the rear muffler crack and a loss of power.....but no concrete evidence

 

That was the plan but my car won't be done until tomorrow.

FYI my side muffler was cracked, so I figure I take them off and replace with CUP connection pipes.
The reason I did not do that in the first place is because I love Sharky sound and I already broke the original Ti exhaust after a few track days bone stock.
I hope I like the new setup sound, if not I go back anyway.

Now I am not using the Ti one because I think it will break again, I am using a donated stock '07 GT3 center pipe instead. We will see how the steel center piece holds up.
You'd can also put a CUP center piece so you don't have to close one holeor you can put on a baller Acropovic like Izzone. It does look like jewelery!

We will dyno the car but who knows outside temps, we wanted to do it same day.