How much performance gain from headers ??

[jondee86]

Quote:That's a full exhaust (obx header, cat, catback) setup vs a oem with back to back dyno testing.

Interesting contribution thanhngo. The OBX is a 4-1 design, so it
is to be expected that it will show some increase at maximum rpm's.

What is more interesting is that it shows some increase in torque from
3000 to 5000 rpm, an area where the 4-1 design is said to be weak.
Maybe some of the improvement can be attributed to the other changes
in the exhaust system ? Overall, I would have been happy with that

The "whyturbothat" page is one I have read several times. There is a lot
of good practical advice in there !!

Thanks Jango. Pulling one gear higher is a sure sign of improved
torque. My smallport is already strong out of corners with just mild cams.
The exhaust is only part of the improvements still to come. Also to be
done are ECU and quad throttle conversion

Cheers... jondee86