dllubin
Don
I have had a Serra header and exhaust for a number of decades. It has a couple of issues. First, it is designed for 1975 and later cars so the exhaust is on the wrong sides (nobody making good performance exhausts for 74s back then). The other issue is that the header is tied to the engine and the rest of the exhaust is tied to the body using the 1975-> spring setup w/o any flex couplings. Remarkably, this has not caused problem but I still don't like it.
Now that I've got a new engine in, I'd like to do a better job on the exhaust. I originally thought about doing a mirror image of the above by reworking the cat bypass pipe. However, after taking a few measurements, it appears that I could eliminate the bypass pipe except for a short section off the collector and go right into the muffler:
My plan would be to use the 74 factory muffler mounts to tie the exhaust to the drivetrain instead of the body. The muffler would be a Walker or Thrush 17711 "Turbo" type (14" x 9.75 x 4.25, 2" I/O), same as the original which did not survive having rusted on pipes removed.
The only negative I can think of is that the muffler sits a bit lower but roughly the same height as the bottom of the collector. I suppose that removing most of the cat bypass might reduce back pressure a little.
Any comments or suggestions appreciated.
Thanks,
Don
Now that I've got a new engine in, I'd like to do a better job on the exhaust. I originally thought about doing a mirror image of the above by reworking the cat bypass pipe. However, after taking a few measurements, it appears that I could eliminate the bypass pipe except for a short section off the collector and go right into the muffler:
My plan would be to use the 74 factory muffler mounts to tie the exhaust to the drivetrain instead of the body. The muffler would be a Walker or Thrush 17711 "Turbo" type (14" x 9.75 x 4.25, 2" I/O), same as the original which did not survive having rusted on pipes removed.
The only negative I can think of is that the muffler sits a bit lower but roughly the same height as the bottom of the collector. I suppose that removing most of the cat bypass might reduce back pressure a little.
Any comments or suggestions appreciated.
Thanks,
Don