project.ng » longtube headers

JHM longtube headers and STaSIS cat-back

admin — Sun, 24 Jan 2010 03:52:08 +0000

The parts we were waiting on came back from the machine shop and we were able to complete the exhaust installation. The headers sound great with the cat-back; angry outside of the car while reasonable inside the cabin. The piping is 2.5" through and everything is connected with v-band clamps.

You can click the video for a higher quality version.

Ceramic coated longtube headers

admin — Tue, 01 Dec 2009 18:00:00 +0000

My JHM longtube headers have made it back from Performance Coatings! They've recieved a satin black ceramic coating to dramatically reduce radient heat.

We're looking at a 110-120 degree temperature reduction in the engine bay; this should be good for a 11-12% increase in engine efficiency. Gotta love free horsepower!

For a 450-500HP motor we can expect a gain of 50-55HP. Show me a better mod for the money!

Thanks to Performance Coatings and JHM!

JHM longtube headers have shipped!

admin — Sat, 14 Nov 2009 23:32:44 +0000

I received word from JHM that my longtube headers have shipped. The JHM longtube headers replace the OEM headers and downpipes; other cars have been seeing both 20-50 ft/lbs and 20-50 AWHP gains throughout the powerband. JHM reccomends wrapping the headers with an exhaust wrap, I choose another route.

Performance Coating in Auburn, WA will be coating the headers with their satin black ceramic coating; we expect to see a temperature drop of 110-120ºF.

Read more about the headers on JHM's site.

Stock B6/B7 headers:

JHM prototype headers:

034 Motorsport dyno of stock headers and JHM headers; note the vehicle dynoed was an auto. Click image for fullsize.