Who would win?

[Boxtaboy]

Originally Posted by blinkwatt

00'+ Boxster were equipped with an additional set of cats that the 97-99's didn't have. So no,there aren't any cat bypass pipes like you want for the 2.5L engines.

Actually, the secondary cat bypass pipes that Fabspeed sells replaces the set of cats that are connected to the muffler (which the 97-99 models also has), so in theory, you could probably also install them, but then you wouldn't be running with ANY cats on the car anymore, and so that would be illegal. The 00+ models still have a set of precats that are connected to the headers, so you still technically have cats if you install the fabspeed bypass pipes on the 00+ models.

[j.fro]

My wife has a 05 Infiniti G35 6sp manual, no mods. I've got a 2000 Boxster S with an EVO intake, modified muffler, and modified cats. I'm happy to report that the 986 S pulls away at any speed. Before I had the 2000, I had a 1999. As you know, the 2.5 doesn't really come to life until it hits 3500RPM...the G35 would be gone by then

[Cloudsurfer]

I have not dyno'd it yet, but I am inclined to think the FabSpeed exhaust, which deletes the secondary cats and does flow very well, could offer somewhat of a power bump, especially when combined with good headers. Unfortunately, I am also coming to the conclusion that the only way to get a resonance free exhaust is to stick with stock.

Patrick

[chaudanova]

Originally Posted by j.fro

My wife has a 05 Infiniti G35 6sp manual, no mods. I've got a 2000 Boxster S with an EVO intake, modified muffler, and modified cats. I'm happy to report that the 986 S pulls away at any speed. Before I had the 2000, I had a 1999. As you know, the 2.5 doesn't really come to life until it hits 3500RPM...the G35 would be gone by then

Out of curiosity, how do you think a 2.7L would do compared to the G35 6sp?

[cbenitah]

Had an encounter with a G35 last week.. My friends, I won by far, and I had a passenger.. We did it 4 times and I came out first every-time..

2002 boxster S Stock

[PWebRPH]

Having previously owned a 2004 G coupe (sold it to buy Box, of course) I think the Box would sneek by

[edevlin]

"I have not dyno'd it yet, but I am inclined to think the FabSpeed exhaust, which deletes the secondary cats and does flow very well, could offer somewhat of a power bump, especially when combined with good headers. Unfortunately, I am also coming to the conclusion that the only way to get a resonance free exhaust is to stick with stock."

I also thought that, and tried several mufflers. I finally got the Dansk sport muffler, the one that looks like the stock Boxster muffler, but has a higher flow rate. Gives a nice tone, and no resonance.

Ed

[Boxtaboy]

Originally Posted by chaudanova

Out of curiosity, how do you think a 2.7L would do compared to the G35 6sp?

The 2000-2004 2.7L Boxsters are quoted at around 6.4 seconds from 0-60. Let's say official Porsche numbers are a bit high, and argue that it can be as low as 6.0 seconds. Even then, the 07 Infiniti 0-60 sprint in manual transmission is quoted at 5.5 seconds, and the automatic version at 6.1. The new 08 G37 does it in 4.9. Even the 07 base Boxster takes 5.7 sec. to 60, so the Infiniti still has the edge in a 0-60 sprint.

[blinkwatt]

Originally Posted by Boxtaboy

Actually, the secondary cat bypass pipes that Fabspeed sells replaces the set of cats that are connected to the muffler (which the 97-99 models also has), so in theory, you could probably also install them, but then you wouldn't be running with ANY cats on the car anymore, and so that would be illegal. The 00+ models still have a set of precats that are connected to the headers, so you still technically have cats if you install the fabspeed bypass pipes on the 00+ models.

The manifold - 2nd catpipe(1st on a non e-gas) mounting points differ from the non e-gas to e-gas so I don't think the 2nd cat bypass pipes would fit on a non e-gas anyway. The opposite end that connects to the 'u' pipe should fit though(since the mufflers are interchangeable from 97-04.5').

how does the B&b exhaust make the car produce less power?

[Boxtaboy]

Originally Posted by blkboxster

how does the B&b exhaust make the car produce less power?

Porsche's engineers and their subcontracted engineers are hired to specifically design and tune the exhaust to cancel out the resonance and to maximize performance (ie. not lose power). They do this very well....witness all the other aftermarket exhaust makers that may make good sounds, but fail in canceling out the annoying resonance drone.

The ones that cancel out the resonance best are the aftermarket ones that actually are shaped just like OEM exhaust (eg. the Dansk units, the original Cargraphic units, among others).

Most of these aftermarket exhausts claim that they give you 10-15hp just by bolting them on, but in reality, actually makes the car LOSE power. Witness that in the post above, even with the freest flowing muffler (no muffler at all), the car still made slightly less power at certain points than when having a muffler installed, so it proves that the car needs a little back pressure to give maximum power. The key then, is how to design a muffler that creates that maximum power potential while still doing what a muffler should do- cancel out the drone.

Simply put, B&B did not put the extensive hours of research the OEM engineers/designers would have in designing the muffler. They simply would examine an OEM muffler, utilize a universal fit can that gives more sound, weld on the appropriate mounting brackets/u-pipes to make it fit at the OEM mounting points, put on some nice shiny dual tips, and then call it their sports exhaust, and market it for the aftermarket.

However, don't sweat it. I'd say that at the end of the day even a 4hp loss is not a big deal if you enjoy the extra sound you get from the muffler.