How much performance gain from headers ??

[drako323]

Hi guys, I hope you don't mind me bringing up this subject again!

I've recently bought a JDM stainless steel header from e-bay. It is 4-2-1, 1.5'' at the engine gasket, 2.25'' at the other end. It was only 90 dollars so I thought I'd try it. It actually is very good looking, the curves are smooth and the welding is perfect. My custom exhaust maker wouldn't believe it costs so little! But, unfortunately...it doesn't fit!!! It actually gets into contact with the car floor (under the accelerator) just for half an inch or so.

Anyway, do you think that by cutting, re-curving and welding so as to pass clean under the car it would affect performance?

Also, I too have the 261degree camshafts you mentioned along with trd adjustable pulleys. I tried it on a dastek dyno and it made between 129-135bhp, depending on the pulley setting. The car otherwise had OEM header, custom exhaust, hks style air filter, trd oil filter and iridium spark plugs. It had at the time around 220000km without any kind of rebuild. So now I reinstalled the OEM intake camshaft, because it wasn't worth the power gain: too high fuel consumption (average 13l/100km) and too high emissions...need a programmable ecu to work correctly.