any one know of some after market headers out there that are street legal. prices and stuff performance you know same ol same ol. thanks

dont tell me to search either not many threads on this

 

omg - another header threader

Wait for Racing Beat to deliver theirs: http://www.racingbeat.com/FRmazda4.htm

 

The reason for this is there are little to no gains from headers on this car.
https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/obx-rx8-header-73445/ is a very good thread on this subject. But the bottom line on this car is Mazda did a good job on getting the most out of this car without going SC/Turbo.

 

although, with the latest cracks and understanding abou the Ecu, Gains from headers and other small mods might actaully make a little more of an impact then 3-4hp

 

But the threads that are out there tell you everything there is to know.

 

headers, we don't need no stinking headers ...

 

no headers on this car. goes right outa the exhaust port up in the air. that big long line of steel where the exhaust should be is just for looks.

 

^^^LMAO

 

I Recently Bought The Oxb Headers For My 8 , Whenever I Install Them Ill Post How They Work Out. I Have Good Experience With Obx , I Purchased Headers For My K24 Honda And I Could Feel The Power Increase. But A 13b And A K24 Are Totally Different Things .

 

caps lock buddy try it some times

 

wow ENJOY the CEL. IT has BEEN done.

bEeRs

 

You might just want to post in this thread instead https://www.rx8club.com/showthread.php?t=73445

 

The OBX header is badly designed. The two outside ports are the wrong size for the higher HP Renesis engine. http://www.putfile.com/pic.php?img=4018757
As you can see the ports are smaller than the stock header. No HP gains there.

 

Smaller ports/pipes doesn't necessarily mean a bad design. It's not just about volumetric numbers, but also exhaust velocity as well. Check out some of RG's posts on header/exhaust theory.

A smaller port/pipe can, if properly tuned, vastly increase gas velocity which can in turn create a scavenging effect.

Of course I don't know if this is so in the OBX design. Nobody seems to have created a good header yet based on all the info on this board.

Chris...

 

The Renesis does not have heads

 

correct.. but we still have an exhaust manifold.. which is what they are talking about :P

 

autoexe in japan have a manifold that looks well made.

 

maybe that's why a properly designed exhaust manifold works as well or better than any header on Renesis

 

ill change my headers when i put the turbo in

 

lol ?