When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Great link, thanks for posting that. I've also been wondering about this, since I have an LC-1 I'm installing soon, using one of the after-cat fittings. The graph on p. 3 pretty much has the answer (no difference between before/after cat). Thought I'd have to do some kind of correction on the output, but now seems like it should be pretty accurate.