pyro install ?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Like the picture shows, somewhere in that general area. You want a place you can easily reach for the drilling and tapping procedure, and you want to stay clear of access to the bolts in case you need to remove your up-pipes for some reason down the road.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
Likes: 1,335
From: Elk Grove, CA
My 2 cents:
I tapped the threads into my manifold pretty far up the tap, on the theory a larger circumference would provide a stronger thread for the pyro. Since then I've decided a smaller hole (same tap) would be better for 2 reasons.
One, a smaller hole will allow less of the fitting into the exhaust flow. Small difference perhaps, but why block flow unnecessarily?
Second, years down the road that pyro might need replacement, and if the hole is rusted out or chewed up it may be possible to tap it just a bit bigger with the same tap. Beats opening it up for a 1/4 inch pyro.
And yeah, sometimes I just stare up at the bottom of a car or truck for too darn long.
I tapped the threads into my manifold pretty far up the tap, on the theory a larger circumference would provide a stronger thread for the pyro. Since then I've decided a smaller hole (same tap) would be better for 2 reasons.
One, a smaller hole will allow less of the fitting into the exhaust flow. Small difference perhaps, but why block flow unnecessarily?
Second, years down the road that pyro might need replacement, and if the hole is rusted out or chewed up it may be possible to tap it just a bit bigger with the same tap. Beats opening it up for a 1/4 inch pyro.
And yeah, sometimes I just stare up at the bottom of a car or truck for too darn long.
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