I robbed a few earlier threads of pics/comments to summarise.
The 1st series R3's from 2004-2009 with 3 pipes had a similar looking 'lumpy' crossover box/collector that contained the large and heavy cat.
The later 2010 - 2018 R3 Roadsters with 2 pipes like yours had Cats in their large muffler cans and a still 'lumpy' but cat free cross box/collector.
You now have cat free TORs 2 pipes with the stock 'lumpy' box/collector. This box has some welded in gas directing plates but overall it is a flow reduction to what is possible with a decent crossover pipe like the Viking ones from NZ member
@Paul Bryant.
E-mail to
paul@vikingexhaust.com
Early version:
Paul's new larger VIKING Diameter one, Black ceramic or any other finish desired.
Other options on eBay include Dave Platt from the UK
As said by somebody already
"looks like a copy of Vikings, but with crap bends and mounting brackets.
There's no point have a larger diameter tube if it is stepped down at the ends.
A tube will only flow as much as it's smallest diameter."
and jamesoffroad123 on eBay Mudgeeraba, QLD, Australia
Get the best deals on Motorcycle & Scooter Exhaust System Kits with Manufacturer Warranty 1 Year. Shop with Afterpay on eligible items. Free delivery and returns on eBay Plus items for Plus members. Shop today!
www.ebay.com.au
That is a good start for your research.