Homemade header
Back on my quest to build my own header, because that's about the only choice we z5 owners have. And the crack in my manifold may have something to do with it...
So I had previously purchased these:
I plan on port matching the primaries to the factory exhaust manifold gasket(and then the head to the same gasket).
So my trip to the junkyard today discovered the oft elusive and pesky pre cat:
This little bastard almost got away...the junkyard told me they won't sell catalytic convertor related equipment. I asked them to wait a minute, went around the corner and hammered out the internals. It's just fat downpipe now. The guy found that humorous and sold it to me for $15.
I was originally going to make my own pipe to replace the precat and just wanted it for external dimensions and fitment. But now, I'm thinking this is the sneakiest way to get what I want without tipping off the smog folks...
I'll use a 2.5" pipe insert flared at one end and welded in at the bottom...or even a velocity stack might work. I'll pack the surrounding empty space with exhaust material(steel wool or fiberglass). I'll put some small holes in the pipe so that any exhaust gas passing through the sound deadening material can still pass into the exhaust piping.
And I'm going to order one of the secondary o2 sensors replacement resistors...we'll see how this works. Hopefully this all be done next weekend.
So I had previously purchased these:
I plan on port matching the primaries to the factory exhaust manifold gasket(and then the head to the same gasket).
So my trip to the junkyard today discovered the oft elusive and pesky pre cat:
This little bastard almost got away...the junkyard told me they won't sell catalytic convertor related equipment. I asked them to wait a minute, went around the corner and hammered out the internals. It's just fat downpipe now. The guy found that humorous and sold it to me for $15.
I was originally going to make my own pipe to replace the precat and just wanted it for external dimensions and fitment. But now, I'm thinking this is the sneakiest way to get what I want without tipping off the smog folks...
I'll use a 2.5" pipe insert flared at one end and welded in at the bottom...or even a velocity stack might work. I'll pack the surrounding empty space with exhaust material(steel wool or fiberglass). I'll put some small holes in the pipe so that any exhaust gas passing through the sound deadening material can still pass into the exhaust piping.
And I'm going to order one of the secondary o2 sensors replacement resistors...we'll see how this works. Hopefully this all be done next weekend.
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