ragtoprafa

Decided to with Princeton Porsche...they made it easy: friendly, knowledgable staff, no pressure, and a loaner car ('06 Boxster) for the duration. Here's what I'm going with:

EVOM Tuning Package Stage 2VFH:
EVO Proprietary GIAC ECU Calibration,
EVO Billet 90 Degree Diverter Valves,
EVO/Milltek Sport Exhaust w/ 100 Cell Catalysts
EVO V-Flow Air Induction System
EVO Sport Headers (K16 design)
Powdercoated OE Turbo Wheels (Black)
New Tires (Yokohoma)
Porsche Sport-shifter


Anyone have any experience with the EVO Sport Headers? How much louder are they than stock?

Thanks!

RTR

Michigan 996TT

Whats the point with your set up. Horsepower is nothing really.

ragtoprafa

Not sure what you mean...

yetis

Cheers to Michigan 996TT for a great second post..... Rag, say high to Ed for me!

tkerrmd

Evo headers while claimed by them to increase hp some are not usually needed or consided much of an improvement at you upgrade level. Most say the factory headers are fine to 600hp. Others say the OEM headers are good enough and just port and ceramic coat the stock headers. So cool upgrade may help, cant hurt? may not have been needed. And I must agree I dont understand Michigans post either? But seems to make yetis happy!

Joe Weinstein

Hi. For what you're doing to the car, the headers will be a waste of money.
Stock headers are well designed and many of our most respected tuners
and owners will say they are fine for 996tts up to 600hp.

Dock

I'm not sure the headers provide any sound difference over OEM. I'd just port/polish the OEM headers.

Two questions...have you considered the B&M Short Shifter, and what's Princeton charging?

wross996tt

I believe the headers are a waste of money. As others have said...if anything porting and polishing stock headers may help when you are near 600hp. The aftermarket headers sometimes increase the distance the air must flow and this is not desired (i.e., the stock headers are about as short as you can get). PS I have a flashloader (GIAC) if you want one pm me.

klein90

Ok I'm lost with the Porting and Polishing. Does any body have pics of before and after this is done and dyno numbers. It seem to me you are better off buying headers then playing with stock. And why not pay for the heads to be ported and polished.
Thanks

wross996tt

The key is airflow. Inside the stock headers it is quite rough with welds not smooth. This creates turbulence and dirupts the airflow. Porting will smooth out the rough spots and polishing will of course smooth the surface finish allowing for less turbulence and better airflow. I had Kevin port and polish my heads when I did my last upgrades (he sent me another set and I sent him my OEMs when they were replaced). I should have taken pictures...the difference is unbelievable. Again, you can buy aftermarket headers, but this does not mean they will improve airflow...and you don't want to increase distance. A lot of folks seem interested in having them look good on the outside (e.g., chrome), but that of course does not matter for performance.

tkerrmd

wross, dock, Joe, your opinion on the ceramic coating on the outside, yes or no? tx

Joe Weinstein

ceramic coating can help somewhat *on the outside*. Theoretically it
would be cool on the inside too, but there have been cases of coatings
coming off, destroying turbos, so I wouldn't risk it.
I don't know of any aftermarket headers that have the insulation/double-walling
that the stock headers have. That's part of why the stock ones are so good.
Also, for a turbo you want the runs between head and turbos to be very short,
and the stock parts do a very good job of that. The porting of the stock
headers is a minor cleanup at the inlet.
Joe

tkerrmd

thanks Joe

Kevin

I HAVE to load up the DIY header pictures for everyone to see the difference.

If you were to CC the factory headers vs ANY aftermarket headers the factory units will have less volume. Less volume and less distance between the head exhaust port to turbine wheel = less static pressure which will result in reduction of lag. The only discouragement with the factory headers is the internal welds that restrict the flow. Grinding 90% of the weld will increase and smooth out the air flow.

Ceramic coating the stock headers is a good idea/however it is a better idea to coat the headers and turbine housings (outside not inside)..

Oak

grinding the stock welds= no measureable difference waste of time. if you need the psychological difference and have a day or two to waste then have fun.