07 g35x Fast intentions exhaust

[suby01]

new toy came in according to dyno it gets 9 whp and 7wtq

full cat back. ordered from fast intentions preffered this one over stillen because didnt want anything too loud. and stillens cat back is definitly the loudest and with less power gain because they use a Y pipe and the fast intentions uses a X pipe mid section.

i got the exhaust on monday.. just got around to install it cuz i dindt want to waste a whole day on the ground and being under they car swearing at life. took it on a lift the entire install took 20 mins to take it off and put this one on.

the sound is seks. like britney and paris at once

taking off you can hear the growl up to like 2500 rpms but flooring it cant hear it only intake.

and on highway speeds 60++ cant hear it at all which is weird.









heres a quick idle vid.

http://www.youtube.com/watch?v=RXkxknQzYxU

havent really noticed any power gains just yet.

[awdjdmtalon]

Very Nice. I love my FI exhaust. Glad to see that you dyno'd it. And that the gains they claim are true.

[4drsleeper]

Hey Suby,

I noticed you got rid of your BD Power Pup and went with the Cobb. What's the deal with Cobb's web-site saying that you have to have stock intake? I noticed you still have your Stillen intake...please explain.

Edit***Nevermind. I just realized the difference between AccessPort and ProTune.

Anyway, almost 300WHP is awesome.
Modified by 4drsleeper at 12:21 PM 7/2/2009

[suby01]

exactly. my cobbs is FS if your looking for one.

[4drsleeper]

exactly. my cobbs is FS if your looking for one.

Sure. I'm interested. But I have to ask why? If you've gotten such great results why would you sell it. I'm assuming you don't plan on making any adjustments so you're selling the software. Let me know.

[pfarmer]

Sure. I'm interested. But I have to ask why? If you've gotten such great results why would you sell it. I'm assuming you don't plan on making any adjustments so you're selling the software. Let me know.

Engine malfunction.

Perry

[RobTurbo]

Can you explain the malfunction?

[pfarmer]

Can you explain the malfunction?

Broken crank.

Perry

[RobTurbo]

What? A broken crank when he was only pushing 300hp at the wheels? Doesnt quite add up in my head. Is there something I am missing?

[suby01]

now back to topic. about the exhaust.

[AZhitman]

That's NOT an X-pipe.

As far as I can tell, it's a dual-in dual-out Magnaflow pre-muffler, which makes no sense in this application.

http://www.magnaflow.com/02pro...=8203

A tangentially-siamesed crossover (X-pipe) looks like this:

[terrycs]

That's NOT an X-pipe.

As far as I can tell, it's a dual-in dual-out Magnaflow pre-muffler, which makes no sense in this application.

http://www.magnaflow.com/02pro...=8203

A tangentially-siamesed crossover (X-pipe) looks like this:

All four ports on the magnaflow are all connected to each other. The exhaust gases from each bank are actually mixed in the x-over muffler.

[AZhitman]

I'm familiar with the internal construction of these, as we used them on our prototype Q45 system (towards the rear).

The internal pipes are perforated and surrounded with steel mesh and batting (for sound absorption).

Hardly a "crossover", and DEFINITELY not an X-pipe.

While there may be some "blending", the real purpose of an X-pipe will NOT be achieved with a unit like this.

[awdjdmtalon]

AZ, wondered the samething when I got mine. I looked in it w/ a flashlight. And it is an X pipe. It looks like the first pic you posted, only perferated. The outer case that it is set into has sound deading material in it. But it IS an X pipe inside the shinny pretty Magnaflow case.

[AZhitman]

Fair enough.

Not a bad idea, I guess - combining a pre-muff with the crossover.

I'd still prefer resonators and a non-perforated crossover.

[RobTurbo]

why do you still prefer resonators and a non-perforated crossover?

advantages and disadvantages being....?

[pfarmer]

What? A broken crank when he was only pushing 300hp at the wheels? Doesnt quite add up in my head. Is there something I am missing?

I think the final consensus was the aftermarket UR pulley may have been involved. Anything that could contribute to a different balance of the crank either vertically or in the long direction could cause issues especially if it were to introduce a different set of engine criticals other than design. However you also have high flow cats which on various engines can cause issues if they fail. You also have tuning. All of these are something to consider, there may be some benefits but along with that there are almost always risks that come with them.

Perry

[pfarmer]

Fair enough.

Not a bad idea, I guess - combining a pre-muff with the crossover.

I'd still prefer resonators and a non-perforated crossover.

My other car came with a collector, a muffler and resonator. Now it has a collector, a muffler and resonators. In its case the collector looks like a fairly long muffler in either a 2 into 2 or a 2 into 1 arraignment depending on model.

Perry

[AZhitman]

why do you still prefer resonators and a non-perforated crossover?

advantages and disadvantages being....?

I'd have to see the one that FI is using, cut open.

Perforations disrupt flow. A real resonator is tuned via length and diameter, using reflected waves to cancel the "annoying" frequencies and thereby suppress noise.

Perforations and packing in a muffler (which this appears to be) use absorption to suppress noise.

I'd prefer a tangentially-siamesed x-pipe, with no perforations (or, simpler, a Y-pipe), and a straight-through resonator, and leave the mufflers at the rear of the car where they belong... exhaust gases have cooled by then and velocity is not as important.

It'd also be lighter.

Also, I'd maintain that the necessity of a crossover is minimal on a small-displacement 6-cylinder that isn't plagued by competing simultaneous exhaust pulses.