When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
This could be true about the measurement, but I still believe that the car doesn't perform as good as it should.
For anyone who is interested, I got some 3.8s headers for 80 bucks and iam going to replace the eBay headers with those and report if there was a noticeable improvement.
The cats are from magnaflow. Sure a n/a engine can't achieve much power trough performance mods, but we are talking about 30 hp less than the factory numbers even though the car got faster...
so nearly every item you listed, I've found multiple folks who have tried them and found they cost power. Sad but true.
The K&N intake is a great example of non engineered solution,, their filter that fits in the stock airbox, nets more power
gain than their entire intake system. Mostly because the K&N doesn't get a solid cold air supply, and the factory does.
Example,, Magna flow cats, in real wholesale numbers are a 100 dollar cat, the factory Porsche cats are not 2500+ just for the Porsche tax..
Porsche spend hundred and hundreds of million of dollars on engine airflow design. if headers were that big of a deal they would be on there.
once you touch 100HP per liter.. average cost of 10more HP is over 10000 dollars. Cost for horsepower per cubic inch grows logarithmically,
Thats why a F1 engine is millions to build. Thats why headers are so over rated on most stock engines.. the entire system has to be flow matched to the head the
cam the intake the air temps... it all counts. Heck if you want to get top numbers , the header design for a sea level pull is different than the header for a pull at 5000 feet.
Head to head, the stock 996 exhaust header is hard to beat, While Porsche isn't perfect, they don't ever leave much untapped power on the table.
I've had enough exposure ot head to head testing on a ENGINE dyne that headers SELDOM if ever produce the gains people think they do.
Dyno's are a relative measurement, not an absolute, no two produce the same numbers because there are too many places the operator
can tweak that affect end power displayed. If the dyne area is NOT climate controlled generally the numbers are just tuning , not real power.
A real dyno cell that can produce repeatable numbers is over $600K You need 100% temp and humidity control in sealed environment..
The HVAC has to be able to handle all the heat and keep the humidity under control to match the power output of the engine.
You dont want the dyne being readjusted for every pull.
05-02-2018, 04:28 PM
so nearly every item you listed, I've found multiple folks who have tried them and found they cost power. Sad but true. 
