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Actually, there have been people who have dynoed the B&B, and found that it LOST power. I think the GHL muffler is one of the few aftermarket ones that actually give a bit of a power gain, and that the Factory PSE doesn't give you a gain or loss, but increases sound.
Posts from another board:
"Re: Does anyone like the B&B muffler sound level?
Alan,
I hate to add to the negativity about this exhaust, but I JUST went through this exact exercise with the latest TriFlo. Here is my findings:
1> It's nicely made overall, but it didn't really fit very well, riding along jammed against the little silver 'paint protector pad' that surrounds the exhaust cutout. Could melt, discolor and/or rattle in that area eventually.
2> I dynoed it and lost 4 HP across the ENTIRE rev range compared to stock - a result that is consistent with others that have done the same testing.
3> It sounds great everywhere BUT in the dreaded 2300-2800 RPM range. You must understand that resonation is a characteristic of the ENGINE, not the exhaust. But it IS up to the exhaust to 'muffle' that noise, and only the stock exhaust or stock-based aftermarket exhausts seem to be engineered to accomplish this without loss of power. I know this because I autocross my car WITHOUT an exhaust at all, and though it is quite driveable that way (surprisingly so), it resonates quite badly in the exact same RPM range as above.
So, if its power, a nice sound and NO resonance that your after, then I think that you should probably do as Robert (Agoura Hills, CA) says: get a stock-based aftermarket exhaust or just stay with the stock muffler and spend your money on other areas of improvement like the intake."
And more...
"I was amazed how acceptable the noise is without a muffler. It is certainly LESS loud then the Yo-Buddy Civics with sewage-pipe exhaust tips, and less annoying as well.
I just traveled 3.5 hours each way on the highway for an autocross in Atlanta, and once you're up to speed and can keep it out of the 'Resonation Zone' of 23-2800 RPM, it is quite liveable - IF you like the constant sound of an engine - I do. I don't think that I would suggest this to someone about to get their Boxster inspected or for generic, daily street use, but it wouldn't stop me from driving the car on the street occasionally between autocrosses, either.
As for the Dyno results, we made 4 runs per configuration with the B&B, then without a muffler and then the stock exhaust. I had been driving with the B&B for a few weeks prior to the test, so it had the best chance at being 'acclimated' to the engine management computer. All runs were made back-to-back during stable weather conditions, all within a 2-hour period and the exhaust was the only change that was made. This was a very static test.
You've heard about the results of the B&B in the thread above. This was predicted, yet still disappointing. What wasn't expected was the results the no-muffler runs produced compared to stock. The curves were IDENTICAL up to about 5K, then the stock muffler kept a clean, rounded curve where the no-muffler plateau'ed off and lost about 1.5 HP between 5K and 6500, then converged with the stock curve again from 6500 to redline. There was NO loss of torque at the low end without a muffler, which is surprising.
Honestly guys, this just proves the fact that you CANNOT gain power on a modern Porsche by simply replacing the exhaust. Maybe you could realize some gain by installing an aftermarket exhaust ALONG with changing the air intake, throttle body, engine computer fuel mapping, headers and the FOUR (!!4!!) catalysts that this engine uses. That I will give you.
Until then, you are only making noise..."
To answer your question, on a closed course, you could perhaps take the G35 if the course had a lot of turns perhaps, but on 0-60 sprint, I think you'd lose.
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