I don't doubt he's a sincere and knowledgable guy, but exhausts come up on here all the time, so why not just take 10 mins to explain the benefits for everyones' benefit? Not everyone wants to ring businesses up, especially not in the current e-commerce world, and especially not if they have to try 3 or 4 times to get a response. They just want a simple click and buy. "Give me call" reminds me of the old pre-internet days of "Price on application". Nah, sod that, I'll go with someone who actually presents the information up front.
Given the volume of exhaust/cat queries on here, it wouldn't hurt to explain to people why their cats are better than competitors.
The fact of the matter with cats is none of the aftermarket 'sports' cats come close to the OEM part. 10+ year old OEM cats still get through emissions due to the superior substrate quality and higher precious metals content. It's why cat thieves are only targeting OEM ones because they know pattern ones are worthless in the shady underworld market.
In terms of sport cats, the bigger the better. I just take issue with exhaust brands luring customers into the belief their tiny little 100 cell cats will always pass the MOT when it's not that clear cut. It's borderline in many cases at best, and flat out fail at worst. Customers/testers shouldn't need to thrash the crud out of their cars to scrape a pass.