i have the A1 sidewinder 1 5/8" on my T4 2056. it's a nice unit - but definitely pricey you know the one you posted is a Chinese copy, eh? good price, but as i get older, i have stronger feeling for quality and principal. i can barely stomach those EMPI ads in HotVWs that say 'insist on genuine empi' with a picture of the IDF copy carbs. i agree with Bill - wait to get a quality unit.
I regret that I have but one "like" to give for this comment.
A genuine A1 Sidewinder is a couple hundred bucks more than the Chinese knock-off. You get more for a couple hundred bucks, but even if you didn't-- Tiger invented the concept, and somebody in Asia copied it.
If more people insisted on getting stuff that worked and was fairly priced (as opposed to being 100% price-driven), this hobby would be in WAY better shape.
I'm not anti-Asian-- the Vintage Speed link Glenn put up is a good example. I'd consider that if I were looking for an exhaust for a sub-2L engine, because he designed his own thing and marketed it as such. I love the Vintage Speed shifter, but it's the same deal-- he designed his own, and didn't just rip off somebody else's deal.