"HoustonRunner" (houstonrunner)
07/12/2020 at 13:57 • Filed to: None
0
5|
"HoustonRunner" (houstonrunner)
07/12/2020 at 13:57 • Filed to: None | 0
| 5 |
I was able to find time with my brother in law this weekend to remove the cat in my E28. I thought I had heard some rumbling around in the cat a couple of different times, and in Texas it doesn’t need an emissions check so I don’t need it. In addition I didn’t love the exhaust sound, so I thought this would at least be different (if not better).
Here is what it looked like underneath, with tape measure to determine how much pipe I needed to buy.
Not a lot of pictures, but first we cut it out just in front of the cat and pulled it out, then cut the cat off completely.
Surprise - the cat is completely empty.
Whatever I thought I was hearing was definitely not pieces of the cat rumbling around. Basically it was acting as a resonator only.
With the right reducers (3" coming from the manifolds down to 2" entering the muffler) and 24" of 2.5" in between, my brother in law welded up the pipes.
Once we got it up we decided to use an exhaust clamp on the manifold side connection for now. I’ll drive it around a bit, and if I don’t want to make any other changes he’ll weld it up for me.
First drive - it is a little louder, and a bit more drone at 2,000 - 2,500 RPM. Not a big difference, and I’m not sure I like it better, but different.
dogisbadob
> HoustonRunner
07/12/2020 at 14:29 |
|
You didn’t put in a new cat? Universal cats aren’
t expensive
|
HoustonRunner
> dogisbadob
07/12/2020 at 15:12 |
|
No. I may at some point, but it isn’t required as the car is over 25 years old, and I go through a tank of gas maybe every 5-8 weeks (don’t know how many miles since the odometer doesn’t work) so not having one doesn’t weigh on my cons cience too much.
GLiddy
> HoustonRunner
07/12/2020 at 15:22 |
|
Not that it probably matters to you, but at one point I remember that mechanics would refuse to work on cars that had the catalytic converters cut out.
|
HoustonRunner
> GLiddy
07/12/2020 at 15:33 |
|
My brother in law and I talked about that as well . I’m not too concerned - if I get into something I don’t want to tackle and a shop tells me that, I don’t want it worked on there.
Jb boin
> HoustonRunner
07/12/2020 at 18:27 |
|
Keep in mind that even a “s port” catalytic converter will remove around 90% of the emission of HC, CO and NOx when at temperature so it’s not a marginal improvement .