Fujitsubo A-S Exhaust - Nissan X-Trail 2.5 4Wd TNT31 53521-S5A-003 The runner sizing follows a

The runner sizing follows a carefully calculated stepped design to balance velocity and flow:

In addition to widening the spokes

Aggressive 9 spoke design

That being said

Fujitsubo A-S Exhaust - Nissan X-Trail 2.5 4Wd TNT31 53521-S5A-003 The runner sizing follows aEstablished in 1931, Fujitsubo have been manufacturing exhausts in Japan for many years, providing them with the sort of experience thats required to craft some of the best exhausts on the market. A JDM brand in the purest sense, Fujitsubo exhausts have been widely recognised as being some of the best systems available. Designed to offer a sporty exhaust sound and carry less weight than OE systems, but at a lower price than full exhaust systems. A S