Leaning towards GHL Exhaust???

[jmatta]

That is exactly the setup I have on my Box S factory muffler. That, coupled with the secondary bypass pipes makes a great exhaust. Look at the photos in my prior post. Don't know if it makes HP, but the throttle response is far better than stock. Downshift blips are immediate and without hesitation.

bmwm750; does anyone actually have realistic dyno results to prove the claims on the headers? Everything I've read doesn't make it seem worth the cost and hassle of CEL problems; hence, my choice not to go that route.

[Cloudsurfer]

Yes, there are a few sources of dyno results from swapping headers that do show an improvement. Both Turbowerx and FabSpeed have published dyno results of their products. Also, there have been several end users who have done the same on independent dynos.

The factory headers are horribly designed, so its not hard to see how one can get gains by getting rid of them. As far as avoiding CEL issues, I think the best solution is to load the RoW map into the car which simply ignores the secondary O2 sensors.

I am very happy with my setup. Combined with the light flywheel, it's a completely different car.

[Adam]

Originally Posted by bmwm750

The factory headers are horribly designed, so its not hard to see how one can get gains by getting rid of them. .

What?! Are you talking about these headers? I mean with the 90 degree turn into the cat and small diameter, unequal lengh runners that taper down and get even smaller before entering the collecter. I doubt there is room for improvement!

[Cloudsurfer]

Originally Posted by Adam

What?! Are you talking about these headers? I mean with the 90 degree turn into the cat and small diameter, unequal lengh runners that taper down and get even smaller before entering the collecter. I doubt there is room for improvement!

Yes those headers Apparently, Porsche must have tried all kinds of new tricks to get every last pony out of these motors with those headers LOL

[GQ IMAGE]

Can we put together of list of Boxster Exhausts that do not create cabin resonance? Is there another brand besides Fabspeed???