I have kooks. I made a post about them a couple years ago. I like them a lot. The car made 494hp 522tq at the wheels with just the headers, no cats and a corsa....and it sounds mean!
I should have had them coated to cut down on the heat. Some of the flex loom on some wiring has melted, though I have seen the same thing on cars with belangers too which are coated.
Kooks angles the down stream o2 sensor to make more room to help reduce the chance of melting the wires.
Kooks headers are a 5 into 1 witha nice merge collecter and they are one peice so installation is very difficult compared to the other multi piece headers.....never had a leak though.
A couple of things about headers:
Not long after header install, you will notice that your gear shift suddenly becomes VERY hard to get into reverse, and overall gear shifting is difficult. This is because your wiring on the O2 sensor has gotten too close to the headers, the insulation melted, and there is a short, which blows the same fuse that your gear shift reverse lock-out solinoid uses. I can't keep track of the number of times this has happened to people. So, make sure that you insulate the wiring near the headers with heat resistant materials.
On a similar vein, I would highly recommend heat coating on your headers. I used a ceramic coating from HPC called "hypercoat extreme" I was truly amazed at the difference it made in keeping my headers (and engine compartment) cool.
I wasn't able to find the 'hypercoat extreme' ceramic coating on the site that you listed. Do I need to call them to get information on the product? Is it a spray paint or do the parts need to be dipped? Did it change the color of your headers? Do you still need/use heat shields for your headers?
Says the drivers name for the 09 in video is Viperless. I wonder if it is Keith on here,a.k.a. Viperless. He has an 09 graphite coupe just like the one in the clip.
wait iv seena few people in this thread say you dont gain any HP from headers for a gen 3..
im confused. then why spend 3k on parts and installation for something that gives no gain?