Long Tube Header Dyno results & Photo

[tk-421]

I'm interested, although it's not immediately clear to me whether this header is a 4-1 or a 4-2-1 (or even if it really matters now). If someone would enlighten me I would certainly appreciate it.

[kou]

4-1.

[taKuto]

Originally Posted by tk-421

I'm interested, although it's not immediately clear to me whether this header is a 4-1 or a 4-2-1 (or even if it really matters now). If someone would enlighten me I would certainly appreciate it.

all four ports just are extended and merge together at one point. So it's a 4-1.
A 4-2-1 involves having a pair of ports merge, and then those merged pipes come together to the one pipe.

sorry i dont remember the correct terms at the moment, but hopefully you get the right idea.

so i guess it needs a complete custom exhaust route if we want to keep a cat and other stuff to pass emissions?

[richardholdener]

The header isa 4:1 design. Since we remove the cats for header installation, the only way to install cats would be to reposition them downstream in the exhaust. The header will require and come with a dedicated mid pipe to connect header to axle back.

Originally Posted by taKuto

all four ports just are extended and merge together at one point. So it's a 4-1.
A 4-2-1 involves having a pair of ports merge, and then those merged pipes come together to the one pipe.

sorry i dont remember the correct terms at the moment, but hopefully you get the right idea.

so i guess it needs a complete custom exhaust route if we want to keep a cat and other stuff to pass emissions?

[CASTREX]

Originally Posted by taKuto

so i guess it needs a complete custom exhaust route if we want to keep a cat and other stuff to pass emissions?

This will be an "Off-road" set up since it's catless and it won't pass an emissions inspection.

In order to take your car to inspection you will probably have to keep your OE manifold and mid pipe with the OE cats and modify it to add a flange in a way that you can remove the long tube header and mid pipe and install the OE back for inspection purposes.