NOTE: We are now taking orders for B-series street/strip and full race headers.  Call us for details and to place orders.

D-series units are slated for a new launch in July 2008.

We receive numerous inquiries around our unique, true merge collector, header designs.  On a popular enthusiast message board, Engr. Bisi Ezerioha responded to questions around the logic behind his designs, and the reasons why they resemble Formula 1 units:

"Greetings all,
I was notified of this post, and quite suprised at some of the comments generated.

The rationale for the bends on my designed header is as follows: I noticed a given area beneath our vehicles that can assist with the scavenging effects of the header. This was realized with manometer/ pressure differential tests done on my crx, and 2 other civics. I was pressed to design a unit that could terminate at this area for obvious reasons. I also had the additional challenge of an ideal length and size of header piping to allow optimum exhaust pulse tuning, which was dependant on RPM range, displacement, etc.

My experimentation with fluid dynamic concepts of "flow in pipes" proves that you can achieve the same flowrate and fluid friction in a given straight pipe in one of specified bends if sized properly. In simple terms, a smaller stright pipe flows the same (and experiences the same friction losses) as a calculated "bent" one of larger diameter. There is plenty of scientific documentation on this subject as well. Hence, this concept is one I use on my own race car to generate ideal HP and torque numbers, with a very simplistic setup: simple carbs, a SOHC, and ignition!

As for the F1 analogy, yes, clearance/aero package may be the reason, but I had compartment constraints as well. In regard to underhood temperatures, I always suggest ceramic coatings...just like on my vehicle.  (This coating also promotes significant longevity of the header unit; stainless steel units provide the best longevity and strength)

I am not a businessman trying to sell headers. I am an engineer, scientist, and racer who desires to bring great technology to the masses...at a decent price."

Dyno and track proven new generation Bisimoto headers will soon be available for Honda D, F, K and H series powerplants.