What race/hi-flow cats?

[Chas3n]

Looking to weld in hiflow cats, OE section 1, any suggestions?

[scotty737]

The best would be HJS or GESI. I have some sort of cheap vibrant ones and they have been fine though.

[Obioban]

If you're actually tracking/racing, get the HJSs. They hold up to the heat like nothing else I've seen (including stock-- I failed my stock cats at 64,000 miles).

If you're saying you're keeping your stock US section 1, I think SS actually sells an e46 m3 OE BMW US header HJS replacement cat, for that exact purpose.

[Tbonem3]

Does anyone have links to GESI or HJS 200 cell? I can only find 300 cell 2.5" GESI for about $3xx-400 per cat on ebay/amzn.