[erix920]

Hey all, just wanted to post an update with my cheap catted downpipes from GCA. I've read countless post saying the only way out of a CEL is a tune or high quality high flow cats. I was interested in the downpipes from GCA because they were 1k shipped, stainless, heatshielded, catted, etc. You get what you pay for and you can see it in the welds, but otherwise they sound great and keep some heat in the pipes.

Anyway, I tried pretty much every o2 spacer available and the one that works for these downpipes is a 32mm straight spacer and 3 copper crush washers. That ends up being a 36.5mm spacer. I've been CEL free for about 500 miles and just passed the CT emissions testing this morning.

I have some screenshots from my scan tool of the waveform if anyone is interested. It still oscillates like it would if a cat was bad, or inefficient, but it's just good enough where it doesn't trigger a CEL.

[ekaz]

Link to downpipes?

[erix920]

I got them from here https://german-car-accessories.com/p...44988927901918